Self built PC shuts down with no information

December 1, 2011 at 06:58:18
Specs: Windows 7 Ultimate 64bit, AMD Phenom II X6 1055T / 4 gigs
Hi guys!

I've had a problem for almost a week now.
My computer keeps shutting down, without any information.

It started when I added two small fans into my new Antec Twelve Hundred case. I used to have a horrible case, so I decided to buy a new one.
So the computer worked without any problems for a couple of days after I put all the components into my new case.
After the optional fans were added, the computer shut down. This didn't happen immediately. It was almost 2 hours after the fans were installed.

So then, I thought it was a random shutdown problem. The next time I put it on, it started to say something about the memory (MemOK! light blinking and stayed on). Then a little later, after the computer started to work somehow again, a blue screen popped up, saying "STOP: 0x0000007E (0xFFFFFFFFC0000005 ...)" etc.

So, I bought a new PSU, thinking that the computer can't handle all the components. When I changed the PSUs, a small part fell out of the PSU itself.
The older PSU was 650W, and the new one that I'm now using is 1000w. (dont know if you are needing this information).

The problems kept coming up (MemOK! light burning, shutting down randomly, without any information).

And when the computer shuts down, it looses the connection to the screen and the mouse and keyboard (in fact all the stuff that are connected to the USBs).

So the next thing I did was installing windows 7 64bit on my computer. (I used the same OS as I had used earlier) Still the same problems keeps coming up. Not the blue screen though.

And one of the weirdest things is that if I won't do anything (or let any electricity into the computer) on the computer for +5h, the computer will work properly for ~an hour. If I keep shutting it down, or it will shut down by itself, the problems keep coming up easier.

Could it be a memory problem? Motherboard problem?

Here's the components I use

Motherboard: Asus M4A77T
RAM: Kingston 2x2gb DDR3
PSU: Nexus 1000W
GPU: Palit(?) Geforce GTX 460 1024MB GDDR5
CPU: AMD Phenom II X6 1055T (@ 3.3GHZ)

I've overclocked the CPU a little.
The temperatures are very low, so it can't be a temperature problem.

There's no dust in the case, or anything that could possibly harm the use of the computer.

(Oh, and sorry for my bad english!)

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December 1, 2011 at 07:29:55
Extra fans doesn't improve temp, all u need is one 120mm rear case fan near CPU cooler and also if PSU is mounted at top it act as system fan pulling out hot air from the system case.
How did u know pc loose connection with usb devices and monitor?
"light burning" is a part of error massage?
Nexus 1000w is overkill but it is a solid unit.

You know the real meaning of peace only if you have been through the war.

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December 1, 2011 at 07:39:33
You need to start off by removing any overclocking - set BIOS to defaults. Then check that everything in the case is firmly seated - doing a transplant from one case to another is always problematic as a system gets settled in one case and the move can disrupt all sorts of things. The best way is to completely strip it down and start again as if it was a new build, particularly checking that the thermal paste on the CPU is doing its job,

"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd

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December 1, 2011 at 07:44:57
hi! yeah. I have unplugged the optional fans and two from the front (theres three).

It looses the connection, cause the monitor says "no signal detected" + the light from my keyboard and mouse shuts.
but i've noticed this only happens when the MemOK! light turns on, on the motherboard.
after the light turns on i usually just shut down the computer.
but sometimes i push the MemOK! button down (for a couple of seconds), and it starts to blink (meaning that it's booting the memory?), and then it works again. sometimes it boots the memories, sometimes not.
if the boot doesnt start, i have to shut down the computer by my self and put it on again (and repeat this step until it starts booting by itself).

I think it's meaning that the motherboard is booting the RAMs automatically every now and then, randomly.

sorry, its quite hard to explain and im relatively new to all this stuff.

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Related Solutions

December 1, 2011 at 07:49:57
That case already has WAY too many fans! 3 front intake, 2 rear exhaust plus a huge top fan, right? How many fans do you think you need? And where did you add these "small fans"? Did you try removing them to see if the system returned to normal again?

"The older PSU was 650W, and the new one that I'm now using is 1000w"

650W was more than enough for your system, 1000W is overkill.

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December 1, 2011 at 07:54:40
hey there!
I'll do that! I actually checked the thermal paste on my CPU just a sec ago. there was a little dust mixed in the paste. This might've been the problem. So far the computer has worked just fine.
I'm going to buy more of the paste, and replace it asap.

But I'm still putting the BIOS to default.
Not sure though if the problem is solved.. Stress test doesnt effect the problem. So I'll just have to wait for a random shut down, and keep my eyes open.
I'll let you all know!


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December 1, 2011 at 08:03:46
I'm looking forward to buy new parts, so I bought that case and the 1000W PSU. I put one of the optional fans on the sidepanel, and the other one inside the case. Yeah I removed them (the optional fans + the top fan, and 2 of the front fans.. ooh, and the fan in the back). Yeah, that's alot of fans. Just wanted to test the cooling before buying all the new parts :)

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December 1, 2011 at 09:39:13
More is not necessarily better if proper airflow is disrupted. Side mounted fans are the worse. Did you cover the hole when you disconnected the fan.

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December 1, 2011 at 11:09:26
A case with a top mounted PSU only requires a single 120mm exhaust fan in the rear of the case - that's it! Front intake fans are not necessary & side panel fans are NOT recommended - ever! All they do is disrupt the optimal "in thru the front, out thru the back" airflow.

I don't know what nimrod came up with the idea of putting the PSU at the bottom of the case & even more puzzling is the fact that it's actually caught on with builders. It's a horrible design. Even Tom's Hardware was against it initially:

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