PC shuts down at random, No overheating!

March 3, 2017 at 11:21:13
Specs: Windows 10, Intel core 2 Quad 2 Q6600 2.4GHz / Kingston Dram 1.8V 800MHz 2gb
So after a hard week behind trying everything i could and searching for an answer. I finally decided to post it online.

My problem is, At boot there are short 3 beeps, Meaning it would be a memory fault. However, It can start up and be at idle for about an hour. Sometimes longer up to 6 hours. All fans spin, and no overheating happens. Modules are inserted properly! And I even bought new ram modules because it was widely suggested. But still same system beeps.

Here are my Specs:
Windows 10
GPU: N750Ti TF 2GD5/OC
CPU: Intel core 2 Quad 2 Q6600 2.4GHz
DRAM: 2x/ Kingston Dram 1.8V 800MHz 2gb
PSU MAX: 400w
HDD: Seagate 500gb

Things Noticed.
In the BIOS, The DRAM is set to 333Mhz. Should this not be at 400?
In device manager there is a device called Coproccesor. Witch has a error mark.
Yes, I have noticed the pc is old. It worked fine half a year ago. Not used in between.

Things I already did!
I have Updated to latest BIOS, Latest available is Win7/2010
I have Updated to the latest shipset, Latest available is Win7/2010
New ram has been bought, Same result.
Cleaned the Heat sinks, As the Processor was getting between 80-95 degrees. Now just below 73 degrees(While gaming ofc).
I have stripped the mobo to just one Dram in left side, No gpu, No HDD, still same system beep.

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March 3, 2017 at 12:51:28
Try re-seating the memory modules by snapping each one in and out 4 or 5 times to burnish the contacts.

Were your memory modules purchased as a dual channel set? If not that may explain why the memory controller is not running the RAM at the expected speed.

73c is still high. Did you clean all the old paste/pad off both surfaces and apply new paste according to the specs for your processor? See the link below for correct method.


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March 3, 2017 at 13:18:26
You got to be kidding me, I've been looking for days and I almost just skiped your advice as I would have thought that I already put tho's damn things in for about 30 times.

I worked, Beeped once for successful boot. I'm putting the PC back together as it is almost completely stripped.

Il update as soon as posible. Thank you!

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March 3, 2017 at 13:37:08
Okey.. Well I definitely found something interesting. Maby this is known but, The system beebs 3 times again. Without my mouse and keyboard inserted it beeps once. With one of the two connected (Tried with mouse and keyboard) It beeps twice.

I'm so confused..

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Related Solutions

March 3, 2017 at 15:33:55
OK, I assumed you researched the beep codes for your BIOS brand and version.

When you first start the computer the BIOS brand and version should be displayed on screen. Post that information here. IE (Award ver.3.2).

If the computer is now working OK. Don't fix what ain't broke.

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March 3, 2017 at 19:25:24
Your Q6600 CPU runs at 1066MHz FSB (266MHz frequency). Although you have DDR2-800 (400MHz frequency) installed, it should be set to run at the same frequency as the CPU. However, it would be better to speed up the CPU frequency to match the RAM rather than lower the RAM frequency to meet the CPU.

I could recommend the BIOS settings to accomplish the above but would need to know the motherboard model number. The model you provided seems to be lacking some characters - P6NGM-L, P6NGM-FD, P6NGM-FIH. Also, the CPU temp is way too high so you will have to address that issue 1st. I'm guessing the thermal paste was applied incorrectly. The Core 2 Quad uses the horizontal line method; not the surface spread & definitely not the vertical line. Here's why:


Here's how it should look before installing the heatsink: http://www.circuitremix.com/images/...

message edited by riider

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March 3, 2017 at 21:40:14
When it gives the various beeps on startup does it go ahead and give a screen image or do you have to restart it before it successfully boots?

Have you checked the exact beep codes for your motherboard?

Oh, and sometimes a stuck keyboard key can cause beeps unrelated to the bios beep codes.

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March 4, 2017 at 02:24:32
I tried looking it up but all I could find was:
*American mega trends BIOS V3.7 042910
*A7366NMS V3.7 042910


It's the P6NGM-L. Sorry, It was not mentioned on the Mobo.
I did however put the paste like that. It is indeed a bit cooler. Around 63 Max. Still crashed after 10m.

After the beeps the PC just start like normal. Nothing special. Tried with only mouse and does the same. And all usb devices are new btw. Works on other pc's. If I don't put anything in it does not beep!

What I did found however, The front usb has a pin bent to another one, so it should have shorted the Mobo somehow. Plugged it out of the mobo and it no longer beeped three times. With mouse and keyboard connected on the back it beeps twice now. Starts up as usual of course.

I also checked the power settings and turned everything of as some have had the same problem and this solved it. I Could install a program now which I could not before. But that might just be a coincidence. Still crashes after 10 min hard work.

message edited by Thomthom45

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March 4, 2017 at 07:50:34
American Megtrends is the brand of the BIOS and v3.7 is the version. Look at the link below for the meaning of the beep codes for your BIOS.


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March 5, 2017 at 05:27:34
Please note that your memory is listed as 1.8Volts and standard DDR3 memory is 1.65V or 1.5V so you will need to set your motherboard to work with your memory properly. Either set it manually to the specs listed on the RAM label including voltage or if available use the XMP settings for your memory which will preset it all for you. If this solves your crashing (and I believe it will) and your temps are under control then let Riider recommend improved CPU settings that will improve things without pushing your temps over the top.

You have to be a little bit crazy to keep you from going insane.

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March 5, 2017 at 08:40:35
Fingers, that board uses DDR2 RAM, which is 1.8v.

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