Makes a lot of sense... The bios (and to a very small degree the cpu) is responsible for adjusting fan rpm according to heat/workload. At startup bios does at it usually does and checks the system.... finds that there is no cpu, and ends its routine with a null result (kills its routine) There is nothing at this point throttling back the fans so they run at their default rpm (which is full).

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"At startup bios does at it usually does and checks the system.... finds that there is no cpu, and ends its routine" Blackbill, that's not exactly right. The bios does not run by itself. The CPU runs the bios just like any other program. If the CPU isn't working, the bios doesn't run. Do yourself a favor BACKUP!

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Ham... They run each other... but the bios is first on the scene. CPU is the thinker, but bios (Basic Input, Output) is where the base computer operations take place..... off topic anyway. The point is however that with no instructions, the fans will DEFAULT high.

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Blackbill, I'm sorry but you do not understand how a computer works. The bios is nothing but a ROM chip that holds software instructions. The CPU reads those instructions and operates on them the same way it will read instructions in RAM when windows is running. Do yourself a favor BACKUP!

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Go here to learn about the Bios: http://computer.howstuffworks.com/bios.htm Do yourself a favor BACKUP!

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Ham, I do know how a computer works... and the above is EXACTLY what I said THEY WORK TOGETHER. One can not carry on with out the other. Not sure if you kow how to read.... I am also not sure why you keep trying to change the topic of this thread. If you want to consider wrong answers, then let's look at the one you presented with regards to the topic... "defective cpu"????? There is NOTHING defective.... the fans simply lack the instructions to throttle down so they default at full rpm.

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Well, I tried to teach you something Blackbill. Continue your life with your delusion. Do yourself a favor BACKUP!

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I see... can't come up with a reasonable excuse for your err in judgment so you decide to criticize!? Okay... well since we're on that track... maybe you should consider LEARNING before you teach... you can start by studying FAN CONTROLS, and POWER SUPPLIES. Then maybe you will discover where you went wrong with that rather pitiful excuse for an answer up above!!!

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Gee whiz, we are getting kinda hostile. If I say 'ok you win', will that reduce your frustration? Do yourself a favor BACKUP!

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No frustration here HAM.... and I was not aware that this was some sort of contest. In fact, if we go back and read the thread, we can easily see where this 'challange' (for lack of a bettere term) all started. I didn't even bother to point out your mistake.... until of course you started getting personal.

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This started with the ridiculous idea of running a computer without the CPU plugged in, right? Without it plugged in what are you going to do? Can you even boot a computer with no CPU? Absolutely not, and who in their right mind would do this? What is the purpose of this drill?

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wow I didnt mean to start WWIII with this thread...anyways back to task yeah when I first built my machine I completely forgot to plug the power cable into the CPU's power jack so thats how I know that the fans go much faster with it unplugged than with it plugged in. the machine I am using should be in my signature now so you can try to see if there are any kind of compatibiliy issues. the power supply I am using came with the case and is a 450Watt SmartPower 2.0 ATX 12V V2.0. AMD Athlon 64 X2 3800+ CORSAIR XMS 2GB 2 x 1GB 184-Pin DDR SDRAM Unbuffered DDR 400 PC 3200 Dual Channel Kit System Memory MSI K8N Diamond Plus Socket 939 NVIDIA nForce4 SLI X16 ATX AMD Motherbo

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Not WWIII.... just a few clarifications. As stated before, the fans quite naturally run at full rpm, and they are throttled back through a set of intructions... if you remove the instructions (among the many ways to do this is omit the cpu in some fashion) then the fans will run at their natural speed (full rpm) This can be demonstrated when booting up a normal computer.... Most bios contain an option to control fan speed in some fashion, but regardless to this, the fans go high for a second or 2 when the computer is first booted. They only begin to throttle AFTER bios has been read. If for some reason the bios memory connot be read, then the fans stay high.

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Hi, Ham is correct. The BIOS is nothing but a program. Nothing can run without the CPU. It's the only real intelligence in the system. Jim

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Don't try to convince him. His mind is made up.

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If you read the post... the bios is READ from... not sure why you people can not read!!!??? A...B...C...D it's so easy... and if you put these letters together in certain ways the make words!!! Fan adjustments are made in bios and cpu READS from the bios If there is no cpu then there is nothing to R E A D... the fans stay high. Do we all understand now??????

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Blackbill quote: "At startup bios does at it usually does and checks the system.... finds that there is no cpu, and ends its routine with a null result (kills its routine)"????

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Oh heavans... I give up... you people are just being silly. HAM... you are absolutely right... this is a defective cpu and a weak power supply. And if the poster has any sense, he/she will replace these things IMMEDIATELY!!! But I'll tell you what MEDELROSSIL... If you decide to replace these "DEFECTIVE" parts then please let me know... you can send them to me and I will **GLADLY** pay the shipping charges!! Heck... (quite serious)

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Glad to know everyone is being silly except you. I'm glad you have it all straightened out. I will anxiously await your next post in another subject.

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GXI MAN... Sorry... don't mean to sound superior, if that's the way you are taking this. But it is a point of fact (not opinion) that the fans simply lack instructions to throttle back... there is NO defect here. Maybe my wording was not correct in CLEARLY explaining this... but it IS the case and I have absolutely no idea why people are sidetracking the issue. The fans don't magicaly throttle all by themselves. The routine is written as you set bios (and stored in bios). The cpu on the other hand is nothing but an empty brain until bios feeds it's routine to cpu for action (or cpu retrives bios program, depending on which way you look at it) If cpu is not there then bios can not carry out it's routine (it can not dictate it's Basic Input Output). The fans therefore stay at their default rpm (which is high) This is a pretty simple issue, and I completely fail to understand why everybody is having such a tough time with it???

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I have never seen a bios that 'controlled' the speed of a CPU fan, let alone 'all' the fans in a system, like mdelrossi1 said. Do yourself a favor BACKUP!

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Mine does...ausus board look it up

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My asus bios (board P5LD2-VM) Has a number of fan options: - CPU fan profile mode - CPU Q fan control (Q=quite) - Cpu internal thermal control....enables/disables internal thermal cpu control.. thereby palcing the fans on full time high

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Congratulations Blackbill! You have a very advanced board and bios. But since mdelrossi1 has an old 2.2 GHz system, I doubt if his bios has that capability. Do yourself a favor BACKUP!

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Same basic concept without all the fancy switches.

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I don't know what that's supposed to mean, but I'm through with this thread. Happy 4th if you are a US resident. Do yourself a favor BACKUP!

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Canada... We just had our 4th... (July 1 for us) Thanks

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In any event, ham30 is right. But just say blackbill is right; What tells the motherboard to even start reading the BIOS??

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Oh this is completely insane. I AM 16 and I appear to have a better understanding than half of the people here. The CPU is all of the processing (hence the P in CPU) power of the computer. The CPU thinks. It makes decisions. It does not, however, CREATE the decisions which are made. SOFTWARE creates (based on user input and pre-determinded code) the decision, and the CPU 'decides' (independant of anything else). It's really sooooo simple...and blackbill is pretty much entirely correct. If I disagreed originally, I forgot why now. The BIOS is a piece of software...try to imagine the BIOS chip as a hard drive that boots up first. The BIOS is HARDWIRED to boot first, and it is not possible for anything else to boot before it. When you press the power button, you activate the power supply which powers up the motherboard. The motherboard, as it powers up, "turns on" the BIOS chip which proceeds to boot. In this time, the computer's various fans have been activated. They are connected *almost* directly to the power supply through the circuitry of the motherboard. On old motherboards, such as Socket-7 and even some PGA-370 boards, the fan connector is indeed wired directly to the power supply connector on the board. It was industry-standard for Socket-7 and older motherboards for the processor and case fan have connectors that connect directly to the power supply leads themselves. I attached one of these fans to my video card to aid in cooling it, as it only has a heatsink. There are 4 main possibilities here: 1. BAD FAN BEARING, meaning the fan motor(s) somehow are defective. This actually makes sense, but not as much sense as the other possibilities. It also means a ridiculously impossible coincidence is happening. It makes sense because a defective or worn out bearing casing would cause the fan to perform abmormally fast or slow in certain situations, regardless of the CPU being present, powered, absent, unpowered, or defective. 2. Because the CPU is either not powered or is not present (this was not made clear in the initial post), the BIOS software has not loaded and therefore the fans will operate at their full capacity because the temperature and RPM sensor readings are not being calculated by anything...the CPU is 'dead', so the BIOS isn't taking those measurements and adjusting the fans as needed. 3. The lack of a present CPU has caused an excess of power going to the other 12V circuits in the computer, including but not limited to LED indicators, hard drives, and yes, FANS. All power supplies are designed with the idea in mind that a CPU will be present, so a certain amount of power has been allocated to it. With no CPU, that power has no use and is evenly distributed into the rest of the computer's circuitry. 4. ham30 is hiding in the computer case and is poking his/her finger in the fan blades, causing them to slow down sometimes, which in his/her mind is rendering his/her explanation as correct. MOST IMPORTANTLY, based on the information provided by the thread creator, nobody has logical reason to believe ANYTHING is defective with the unlikely exception of the fan motors, but this is extremely unlikely. In any event, running them at full RPM for extended periods of time will kill them. The BIOS will run them at the correct speed, while if the BIOS is no longer controlling them (such as when the CPU is not powered or installed), they will run at the fastest speed physics will allow them to run at. This will warp or possibly melt the bearing casing, IF the fans have bearings. If they have brushes, well, you're screwed anyway. Brush motors wear out faster than bearings but are quiter. Car starter motors are brush motors, FYI. (ham30, this is not an attack or flame, it is simply my touch of humour. I know this is a topic with a lot of tension, so don't take that the wrong way) If anyone does not understand, the only example to help that I can think of is newer-model HP/Compaq systems. When you press the power button, the fans are ridiculously fast and loud. Once the POST initializes and the BIOS loads, they return to a normal speed. Hope this sorts some stuff out. It's mearly 4AM here and this started as a quick reply, but it started bothering me how people who have aided me with problems in the past clearly are lost with such a simple concept. I'm really tired, and hopefully I didn't leave anything out. If anyone wishes to argue with what I've written, then you are contradicting what many books, websites, and professional computer technicians have taught me. Not to mention all of the experiments I have done with countless motherboards and a multimeter to check voltage outputs. No hard feelings, grudges, or flames, -Kevin ASRock K7S41GX AMD Athlon XP 2500+ 1850MHz 512MB DDR333 WD 160GB IDE HDD ATI Radeon 9200 128MB AGP8x

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