I'm pretty sure it's not my cooling system. Once I get past the "first
boot" hurdle, the PC works perfectly fine for hours. I run for at least
2 - 3 hours (more during weekends, of course ;-)

Right now, this is how I "have to" use my PC:

1. Boot up Hardy
2. Use it while avoiding accessing the hard disk for as much as possible until 
it inevitably locks up.
3. Forcefully cut off the power.
4. Wait at least 10 - 15 secs (preferably more).
5. Turn the PC back on, then use it for my regular stuff (music, web, torrent, 
videos, etc..)

If the machine runs fine for hours, I doubt the cooling system is
causing it to lockup soon after the first time i boot. As you can see,
it's not a very nice experience, not to mention it's bad bad bad for the
hardware. This is even a recently clean installed system. I was having
similar issues before which prompted me to do a clean install.

Previously, it was sporadic lockups occasionally occurring frequently
(several reboots with lockups!!), but sometimes showing no signs of
problems for 1 or 2 weeks.

I did a memory test when it started to happen and everything looks fine
after 1 pass. Whatever it is, sounds like a memtest should find it
within the 5 - 10 minute period but it doesn't, so memory should be fine
IMHO

-- 
Soft lockups in Hardy shortly after boot up
https://bugs.launchpad.net/bugs/250837
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