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could not shutdown

My computer recently crashed during a game of Company of Heroes. The computer then did a spontaneous restart, but instead of booting, went into "startup repair" mode. It finally started, but
when I tried to shutdown the computer would not shutdown. It went to the screen that said "shutting down", but the hard drive just kept spinning. Finally I had to very reluctantly shut down by turning off the power. There was also an update to install, but it did not install.
When I restarted again, it did the "startup repair" protocol again. This happened a few times, but finally I got the computer to shut down and install the updates.
Finally, the machine seems to be working. It starts up and shuts down without any error messages, but startup seems to take a long time and the hard drive keeps spinning for a long time after startup is finished.

Does anyone have any idea what happened?? Was (is?) it a hardware problem or a software problem. I have not installed any new hardware recently, except a new graphics card (low power 9600GT) a couple of months ago. The computer is an off the shelf Acer with an E4500, 3 gig of ram, 300 watt power supply, and is about 2 years old. The only new program that I have installed is the America's Army 3 online game.

I am somewhat suspicious of the power supply, but am hoping that the problem does not recur. I did have problems with start up a long time ago when I updated the graphics driver for an
AMD 4650, but did not update any drivers when this last problem ocurred. Unfortunately, I just did a disk cleanup and deleted most of the old restore points. I have backups on an external hard drive, but not a recent one. I have checked the hard drive and graphics card temps and nothing seems to be overheating. I cannot seem to determine the CPU temp.

Any ideas or help would be greatly appreciated.

 
300W PSU is much too small for a system with anything more then the onboard graphics. This lack of power may be part of the problem but may have also caused some curruption on the HDD. So the first thing to do is replace the PSU and backup the HDD. Then have skndsk check the HDD for errors.
 
Thanks for the reply. I agree that the power supply is borderline. However, it is the low power version of the 9600GT that has a TDP of only 59 watts. It is slightly undervolted and underclocked.

The nVidia site lists the miniumun power supply for this version of the card to be 300 watts.

The comp did come with a discrete HD2400, but of course that is much lower power than the 9600GT.

What would you think of a fresh install of Windows or an upgrade to Win 7? The only problem is that with such a low end comp it does not seem to be worth a 100.00 plus upgrade when I could buy a better comp for around 500 or 600 dollars. (maybe dump this comp to my wife ??)
 
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