System Won't Reboot On Demand

Hi There, I have just finished reinstalling Windows Xp, so my PC is clean of viruses & spyware. I have found that whenever I need to restart the PC that it just hangs on the shutdown screen and then the mouse freezes. I then need to press the reset button in order to complete task. If I need to shut the system down then that works fine. I have a Socket 478 AOPEN mobo, 80gb Western Digital Hard Drive, 256Mb DDR 400 RAM which I have already replaced. I have also replaced the IDE cable from the hard drive and removed the IDE from the FDD. I have an ATI VGA card AGP also I had a PCI 56k modem which I removed. Is it more likely to be a hard drive failure or a mobo failure. Any suggestion would be greatly appreciated.  
peterandlynAsked:
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PCBONEZCommented:
This is more likely a Windows XP problem than a hardware problem.

I'm not 'into' XP so I'll let someone else help you but in the mean time you can stop juggling hardware and put the system back to the hardware configuration you want it in.
nobusCommented:
Look here for a shutdown trouble shooter : (one of the best)

http://aumha.org/win5/a/shtdwnxp.php

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maramomCommented:
Your system drivers may be faulty, causing a shutdown problem. Install the latest updated drivers for your board from AOPEN: http://download.aopen.com.tw/default.aspx
as well as ATI for video: https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&folderID=293
Do the same for any PCI cards and peripherals. For the mouse and keyboard, update drivers only if non-standard.
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