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Computer won't boot after cpu upgrade

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November 23, 2010 6:57:20 PM

Hello there, I have recently joined these forms.
So, basically I have a problem.

These are my specs before
AMD athlon 64 3800+
Nvidia Geforce 220 gt
5 gb ram sticks

One day, I decided I would get a new processor. After doing some research, I found an
AMD Phenom X4 9750 Quad Core Processor

I did some more research and found out that my old processor was am2 and the new one is am2+
After doing a little more research, I found out that it an am2+ was compatible with an am2, so I decided to get it

A few days later it arrived. And basically, I opened my desktop and started trying to replace it.
At first, I was confused because I wasn't able to remove my heatsink even after all the attatchments/screws were removed

So, I did a last weak tug and my heatsink came off.
Now, my old processor was glued on to my heatsink.
So, Me and my dad used some nail polish remover to remove the glue
It worked like a charm, and I was able to remove my old processor.
So, I stuck my new chip in, and reconstructed it/ put it back together.
When I pressed the power button, there was a loud, huge sound coming from the fan.
There were no pictures on the monitor

Usually, my computer starts just by a small beep

So, I removed my heatsink and fan and tried to start my computer
No dice, however, it has been revealed that most of the sounds were coming from my Video card's fan, which is weird because it has never been as loud before. Also, all the lights were functioning, which seemed like a good sign.

So, ignoring the sound, there was still no picture on the monitor.

I tried to shut my computer down with the power button, but it wouldn't work
For some reason, I am able to start my computer via button but I can't turn it off by the button
I had to switch my power supply off and on again.

So, figuring that something was up, I took out my new processor and stuck in my old processor
Just a note, while we removed the old processor, everything was fine. The processor still looked the same as before, we didn't smash it up or anything...lol

So I put back my old processor and started my computer
the same thing

There was still no picture on the screen, a high blasting sound from my video card, and can't shut down the computer by the power button

I then switched video card with my sister's computer which is a geforce 9800 gt
and the sounds were less severe but it still wouldn't boot

This is where I am stuck

I am suspecting there is either something wrong with the processor, or the motherboard, or the power supply

My psu is only 250w by the way

P.S. I have tried removing my video card completely to reduce wattage and seeing if it would boot but it still doesn't

Please reply with as much help as possible
November 23, 2010 6:58:51 PM

Oh yeah and the fan from my psu works and everthing
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November 23, 2010 7:06:39 PM

Starting the PC without a heatsink on the CPU may well have killed that CPU and a 250w PSU is going to to be killed by a 9800GT.
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November 23, 2010 7:17:47 PM

How would a 250w be killed if I have been running a 9800gt for 2 months, and when I switched to a 220gt and have had it for 1 month so far.
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November 23, 2010 7:20:52 PM

pie66789 said:
How would a 250w be killed if I have been running a 9800gt for 2 months, and when I switched to a 220gt and have had it for 1 month so far.

Because the load on the PSU that the 9800GT put on it may well have killed it, is it an eco/green 9800 or does it require a 6 pin PCIe power feed?
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November 23, 2010 7:24:19 PM

The 9800gt still works on my sister's computer
Are you saying the 9800gt killed my power supply
If it killed my power supply, wouldn't my computer wouldn't even be able to start up/fan not working/no lights
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November 23, 2010 7:34:17 PM

A PSU can fail and yet still show some signs of life or it can fail spectacularly in a shower of sparks and smoke, either way running a CPU without a heatsink on was not an intelligent move.
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November 23, 2010 7:36:19 PM

OK. To summarize:

Working computer had the CPU upgraded. CPU came off when you tried to remove the heatsink. New CPU installed. System doesn't work. Reinstalled old CPU. System still doesn't work.

The first obvious thought is that you damaged the motherboard when you removed the original CPU.

Troubleshooting time:

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beeps patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.

Motherboard LED's mean very little. When on, all they are telling you is that the computer os plugged into a live power socket and the PSU is switched.

Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.

Next, either with or without a BIOS upgrade, does your motherboard support the new CPU?
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November 24, 2010 5:20:18 PM

Best answer selected by pie66789.
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November 24, 2010 6:14:14 PM

This topic has been closed by Mousemonkey
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