Help with freezing laptop

I am having a problem with my laptop freezing randomly.  My laptop is a Sony Vaio PCG 9E4L. It has a Mobile AMD Athalon XP 1500+ 1.30 GHz processor. It has the 256 Mb of Ram. It also has an ATI Rage Mobility-M1 AGP PCI video card with 8.0M of SDRAM. I am running XP sp2. I should also point out that when I purchased the laptop I got the extended warranty and had the motherboard replaced probly about 3 years ago.  Normally I would not worry about the freezing since its only got 256 Ram but usually when I can tell when its going to freeze because I am trying to do to much at once.  This however just poof non responsive.  Even if I hit caps lock or num lock it doesnt even turn the caps and num lock lights and the only thing I can do is power off with the power button.  I am thinkin its a hardware issue but I have run CHKDSK and found no errors and checked the event viewer for errors and found none.  Any help would be greatly appreciated.
npbaker1Asked:
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ridCommented:
I think you should test your RAM and your HD with a testing software (not chkdsk). The Ultimate Boot CD has a few useful things on it.
http://ubcd.sourceforge.net/
/RID
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ammowagonCommented:
Also sudden freezing can be due to overheating of the processor. Make sure your vents aren't blocked and try it on a cooling pad if possible.
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npbaker1Author Commented:
Well it is on a cooling pad which is the first thing I got when I knew I was going to be using it at work for 8 hours a day.  And since its pretty much the only thing on my desk I dont think the vents are blocked.  I will give the cd a try.
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npbaker1Author Commented:
Ok I have the boot cd but I have no clue what tests I should run from it.  If someone could point me in the right direction I would appreciate it.  Also I have no clue what brand my hard drive is and am unsure how to find that info.
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Wooky JackCommented:
Have you tried running the laptop on just the power cord (taking the battery out to see if performance is different)?  Or just tried the battery by itself as well?
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npbaker1Author Commented:
No I havent tried that yet.  I was also asking this on another message board and I posted a report and they told me my voltages were very low so its probably the power supply.  If you have any idea how much a power supply costs I would like to figure out if its even worth it for a 4 year old laptop.
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Kaptain1Commented:
Overheating may be the cause, especially on a 4 year old vaio. I"ve had several laptops only a year old, and their heatsink was clogged so bad that no air could come through and computer was working at like 50mhz lol. Cleaning heatsink on a Vaio that age is easy, you don't even have to remove the bottom part. Even if it isn't the cause, you'll find lots of dust/hair blocking the airway anyway.
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