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Won't shutdown

post #1 of 17
Thread Starter 
Hi all,

I had to replace the CPU in the office PC due to bent pin damage on the previous one. This was in a Acer M5100 desktop PC. I was replacing the fan as it is so very noisy after 3 years of operation, and it seems Acer decided to glue the stock fan to the processor, so it ripped it out of the socket when I was trying to free the fan.

Anyways, the damaged phenom 9500 was replaced with an X2 7550. PC boots up fine, and surprisingly Windows 7 did not ask me to reactivate. Windows did install drivers for the new CPU after starting up, and the first couple of boots were a little slow.

Now the problem - the PC no longer shuts down properly. When I select shutdown, it goes through all the motions. Logs out and says its shutting down, screen goes black, I hear parts turn off. But the powerlight stays on and the cpu fan, case fan and PSU continue to run.

Does anyone know why this is happening? My thoughts are that either I need to do a fresh install of Windows due to the processor change, or there is an issue between the BIOS and this CPU as I think it's newer than the motherboard by a year or so. But for the latter, I wondered why it would start up and work completely OK in that case.

Any advice would be greatly appreciated!
SMITH
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SMITH
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post #2 of 17
I think it's just Windows that needs a reinstall, it probably doesn't sent the "shut down" signal to the motherboard after shutting down windows. To see if it isn't some motherboard damage (after riping the CPU from socket) you could try to boot, run and shut down from a Linux Live CD - if it all goes well on Linux there's no reason it shouldn't work well on Windows
Centurion
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Centurion
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CPUMotherboardGraphicsRAM
Phenom II 940 @3.3GHz 1.25V Gigabyte 790X-DS4 XFX 5850 8GB OCZ DDR2-800 
Hard DriveCoolingOSMonitor
Corsair Force 3 TRUE Win 7 Pro x64 ACER 23" TN  
PowerCase
400W Silverstone Strider Antec P182 
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post #3 of 17
Thread Starter 
Ill try that out, thanks for the suggestion. Apart from the shutdown system everything is working A-OK, so I'm unsure if its motherboard damage.
SMITH
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SMITH
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post #4 of 17
You won't need to reinstall windows unless you changed out your motherboard. Are you sure you deleted ALL of the old CPU's drivers? Driver conflict could be causing this issue.

Try deleting all processor drivers and reinstalling just the ones for the new processor.

EDIT: Also try resetting CMOS because the old settings may have been for the 9500 but won't work properly on the 7550.
Edited by jpl7977 - 5/18/11 at 11:17am
My System
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Intel Core i3-2120 Asrock Z68 Extreme3 Gen3  XFX Radeon HD 6770 G.Skill Ripjaws 
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My System
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CPUMotherboardGraphicsRAM
Intel Core i3-2120 Asrock Z68 Extreme3 Gen3  XFX Radeon HD 6770 G.Skill Ripjaws 
Hard DriveHard DriveOptical DriveOS
Seagate Spinpoint F3 Crucial m4 SSD Sony Optiarc DVD-RW Windows 7 Ultimate 
PowerCase
Antec BP550 Plus Zalman Z9 Plus 
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post #5 of 17
Thread Starter 
Ok I'm going to try CMOS reset next. I downloaded a linix live CD and the shutdown problem still exists with that. It went to the dos like shutdown screen where it enters the shutdown command and then just like with windows, half the PC shuts off but the fans remain on. The only difference being the command screen stayed on the screen frozen.

Doing CMOS reset now...
SMITH
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SMITH
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post #6 of 17
Sometimes you can just insert the Windows disk at boot and run a system repair to fix the problem. Ive done that before for booting or startup problems maybe it will work the same for shutting down.
post #7 of 17
Thread Starter 
I'll try the startup disk next. I just reset CMOS and no change. I'm really baffled with this problem. The computer is working perfectly besides this issue.
SMITH
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SMITH
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post #8 of 17
Thread Starter 
Ok so checklist of things that didn't sort the problem:

Reset CMOS
Checked all connections are secured
Run Windows startup repair
Tried shutting down from Linux Live CD and the Windows Startup repair disk

The only thing I've not done is try to update the BIOS as I've not done it before and don't want to brick the PC. Anymore ideas? I'm stuck.
SMITH
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SMITH
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post #9 of 17
So the only thing you did was switch out the chips? And now you have this problem?
post #10 of 17
Thread Starter 
Yup. The PC is working perfectly besides the shutdown issue.
SMITH
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SMITH
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