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Windows 7: Dead CPU/mobo?

01 Dec 2010   #1

Windows 7 Ultimate x64, Mint 9
 
 
Dead CPU/mobo?

Hey all,

So I finished installing my water cooling setup (which works fine), but now my computer won't start up.
The PSU provides power, the fans spin, LEDs light up, etc, but the computer does not post. No beeps, nothing.

I suspect that I might have fried the CPU or motherboard...
Can someone confirm, or (even better) tell me it isn't and I just missed a plug?

I have tried:
Resetting BIOS (doesn't get there anyways)
Swapping/removing RAM
Removing PCI (and GPU) cards

I really hope someone can tell me what is going on... Even if it is just to confirm an expensive mistake...

~Lordbob


My System SpecsSystem Spec
.

01 Dec 2010   #2

Windows 7 Home Premium 64 bit
 
 

Did you use a ground strap to keep the static eletricity away, didn't knock any wires loose on mb, hdd, etc. I'm hoping for the best
My System SpecsSystem Spec
01 Dec 2010   #3

Windows 7 Ultimate x64, Mint 9
 
 

Quote   Quote: Originally Posted by 1Bowtie View Post
Did you use a ground strap to keep the static eletricity away, didn't knock any wires loose on mb, hdd, etc. I'm hoping for the best
I was touching the case the whole time I was working with any components.

I did pull the CPU out of the socket to get it a little cleaner, but again, was touching the case while doing so...

~Lordbob
My System SpecsSystem Spec
.


01 Dec 2010   #4

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit
 
 

I'm looking at your mobo at Asus. You don't have any of the lights on the board like some of the newer ones it appears.

Check list of what you may not have checked. Just possibilities.
Did you recheck the Q connector if you are using it? They come loose very easy.

CPU cooler mounting bracket on the back of the moboard insulated properly? I'm assuming it has one. Some don't. Dead short if it is touching.

The obvious power connectors on the board which I'm sure you rechecked three or four times by now.

If you pulled the CPU you could have bent a pin on reinstall on moboard. Or not seated on the pins properly.
Possibly fixable if you can see a bent one with magnifying glass.
Tweezers maybe. Something plastic. Better yet Bamboo Barbeque skewer.
Maybe.

I'll add when I think of something.
My System SpecsSystem Spec
01 Dec 2010   #5

Windows 7 Ultimate - 64-bit | Windows 8 Pro - 64-bit
 
 

Hello,

I'm not a hardware guy but I could suggest something. Remove the CMOS battery and start the PC and shut down the PC put it back and see if that fixes it. Remove all the RAM and see if you have a Memory beep.

- Captain
My System SpecsSystem Spec
01 Dec 2010   #6

Windows 7 Ultimate x64, Mint 9
 
 

My roommate and I just fixed a bent pin on the CPU, but still no post.

I already tried resetting the BIOS.

~Lordbob
My System SpecsSystem Spec
01 Dec 2010   #7

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit
 
 

It is possible it damaged the CPU. Broke the connections inside.

I actually was hoping I was wrong about the bent pin.
My System SpecsSystem Spec
01 Dec 2010   #8

Windows 7 Ultimate x64, Mint 9
 
 

Quote   Quote: Originally Posted by Hopalong X View Post
It is possible it damaged the CPU. Broke the connections inside.

I actually was hoping I was wrong about the bent pin.
To be completely honest, I suspect it has been bent/broke for a while.

My roommate and I are leaning heavily towards a bad motherboard, because of no power to USB, and no post.

~Lordbob
My System SpecsSystem Spec
01 Dec 2010   #9

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

When working on a problem build it is always best to strip everything down to the bare motherboard. I set it on an anti-static surface (the bag it came in) and arrange the case and power supply close enough to make the basic connections. You do not need to make the case connections at this time. Use a screwdriver to cross the two PWR pins to turn it on when needed. But if I can I hook them up.

Turn on the power supply and turn on the motherboard. Without a CPU nothing will happen, but you do want want to see that green light come on showing the board is getting power. Then add the components one at a time.

When you install the CPU and start you should get an error beep code: no RAM. This is Good.

Add ONE stick of RAM and start. Error beep: No video.
Add more RAM.

Then the video card and monitor. Keyboard (use PS2 for troubleshooting).

If at any point you do not get the expected result you know the prior part is the fault and can work from there. Any time after the RAM test you can put everything back in the case. The reason for out of the case is to eliminate standoff shorting as a cause.

Very rarely is a CPU bad and it takes effort to kill one. Most times a dead rig is a motherboard issue. As a last resort you can try a CLRTC.

The power supply is key. The motherboard has lots of logic circuits and if there is any issue with the power supply it can cause the board to cut out. Use a spare supply to test with, even if it is underpowered for the rig. You don't want to run a full system on it, just those first few crucial components.

Let us know how the process goes.
My System SpecsSystem Spec
01 Dec 2010   #10

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

This just occurred to me. You are water cooling. A motherboard will not boot without a heatsink/CPUfan connected. Did the watercool kit anticipate that?
You could just plug the fan into the CPU header and hold it to test. I think there is a BIOS setting to turn off the fan check.
My System SpecsSystem Spec
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