Computer wont POST

Myself...
May 9, 2006 at 16:05:48
Specs: XP/Gentoo, 2500+/768OCZ

Hi everyone,

I'll try to go into much details as possible as to what I've tried already. I'm out of ideas on this one.

I've recently tried a new stick of ram to test it out for someone...turned out to be a bad stick and my computer wouldn't POST after that.

I figured it fried the motherboard when I tried booting up with it. I've replaced the motherboard today and its still doing the same thing :(

I get power to the board, but no POST. The screen remains black and no signal is sent to the monitor.

So I'm asking what does a computer need to be able to make a successful POST?

I've tried unplugging all HD and DVD drive, didn't work. I've tried with no ram, didn't work. I've tried with no video card and it still didn't work.

I've figured that I would have heard the single beep once at least and would have been able to narrow it down but nothing, which really suck...

I always thought that without ram the bios would give a few beep codes, same for no video card installed.

So to sumarize, its a new motherboard. It's getting power from the PSU (the fans are turning and the HDs are getting powered when I turn it on.

It's however not POSTing (no single beep or signal sent to the monitor). It's not giving beep codes either...just silence.

What are my options here?

I've replaced the motherboard.
I've tried booting with everything plugged in.
I've tried booting with only RAM and Video
I've tried booting with only Video
I've tried booting with only RAM.
I've tried booting with no video, no ram.

All produced the same result...no POST, no signal to the monitor :(

Thanks for the help or suggestion...I dont really want to shed out $100 of dollars just to test stuff, I've thought maybe the CPU got fried but what if its not the CPU?

What if its everything, board, ram and cpu...isn't there anyway to know?


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#1
May 9, 2006 at 16:30:21

To get any beeps, the power supply, motherboard and CPU have to be working. To get the POST beep, you also need working RAM and video adapter.

Do yourself a favor BACKUP!!!


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#2
May 9, 2006 at 16:53:46

Thx, PSU is working since Im getting power to the fans, HD, etc. I'll try to find another system where I can test each components...kinda hard since I have to probably test the CPU...hope my friends trust me enough for that, hehe.

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#3
May 9, 2006 at 17:32:27

>> PSU is working since Im getting power to the fans <<

I'm afraid that proves nothing. The PSU will fire up the fans as soon as power is applied. However, it will not power up the CPU until the power supply has stabilised and the power good signal is enabled by the PSU. Until the power good signal is enabled, the motherboard chip-set holds the CPU in a reset state and doesn't release it until the power is good. Normally this takes about half a second. The 5v line to drive the fans and power the chip-set may be working, but if there is a fault in the 3.3v supply which powers both memory and CPU, then you will never get power good.

Until the reset is released and the CPU is allowed to get on with its stuff, nothing happens, no beeps, sod all.

I would try a known good power supply before anything else.


Stuart


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Related Solutions

#4
May 9, 2006 at 18:54:43

Where do people come up with these ideas?

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#5
May 9, 2006 at 19:26:53

What ideas are those GXI Man?

Care to elaborate.

Stuart


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#6
May 9, 2006 at 19:55:59

This one sounds just like when I had a CPU go bad. Fans but no monitor. But could be a foil or any other condutor on the board. If it is ATX (right?) borrow a power supply and set it up next to the computer with cover off leave all your stuff plugged in to your power supply but only plug the borrowed PS into the mother board (20 or 24 pin), plug both power supplies into an outlet use your computer switch to turn on the borrowed supply that will run your board and jumper "YOUR" power supply's board connector green to grey to power it up to run all your accessories on 5 and 12 volt. If it works your power supply ain't making 3.? volts. Test meter your supply red to black for 5 volt and yellow to black for 12 volt. Load test it by hooking two to three automotive 12 volt headlights to the yellow and black(polarity won't matter) If it will run one or two but not three your power supply is weak for some reason and is not reliable. Yes, I'm a shade tree technician, been working on electronics for years just don't know squat about programming.

Crunch


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#7
May 10, 2006 at 03:15:58

StuartS-

The ideas by the original poster of what it could not be.


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#8
May 10, 2006 at 03:55:59

Sorry GX1 Man I thought you were referring to what I posted.


Stuart


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