I'm having trouble with my computer randomly locking up. I will be using my computer normally, when my computer makes a sort of clicking sound, like when I shut down the computer from windows and the computer shuts itself down. After this sound, my programs all freeze, and no inputs from my mouse or keyboard work. The hard drive access light on my case lights up solid as well. The only thing I can do after this is press the reset button.
Sometimes my computer reboots fine, but usually it has to enter scandisk. The last time this happen, when I rebooted I got a blue screen saying Windows encountered a hardware error and stopped itself from starting. In a paragraph on this screen it mentioned my motherboard was not ACPI compliant or something like this. I have been running this computer for about 2 years and have never had that error.
I have tried reformatting my hard drive. Twice during windows XP. while Windows was scanning my hard drives (I think), I had this problem occur, which leads me to belive this is a hardware error.
Does anyone know what might be wrong with my PC, and any ideas on how to fix it? Any help is greatly appreciated.

























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