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Computer's not starting

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Hi all, I'm having some problems with my PC.

For a while I was encountering lots of BSOD's with the "IRQL_NOT_LESS_OR_EQUAL" message, but it seems to just be a cooling problem. As a stopgap measure, I opened up the case and let a desk fan cool it down, and this seemed to work for the most part. However, it has been occurring a bit more frequently of late, so I decided to sit down and make sure all of the fans are working. I cracked open the case, cleaned out the CPU heatsink (being VERY careful when replacing it), as well as the GPU heatsink. There was tons of dust (as I expected with an open case), but I cleaned it all up.

I also decided to try something else; while the case was open, I wanted to move the sound card to a different PCI slot, as I figured my previous blue screens may have been to do with conflicting IRQ's and - since XP doesn't allow you to change the IRQ allocation - I figured that changing PCI slots may help this.

I got everything screwed in properly and hit the power button. All the fans start without fuss, and the hard drive starts humming - but no beep, and no image on the monitor. The amber LED on the case turns on and doesn't flash like it usually does.

System Specs:
P4 2.7GHz
512Mb RAM
256Mb nVidia GeForce FX5700
Gigabyte P4 Titan Mobo (I guess - that's what the mobo says, anyway :tazz:)
120Gb HD

What I've tried:
- Reseating all removable drives/cards.
- Removing and then replacing the CMOS battery.
- Removing all unnecessary drives/cards.
- Plugging in an old video card.

The only variation I seem to get is that sometimes the hard drive starts spinning, and sometimes it doesn't. I've not been able to pinpoint what exactly makes it do this, though...

I have a sneaking suspicion that it has to do with the mobo, but I'm not sure.

Any help?

Edit: just a quickie: I did a quick search of the forum as well as Google, but found nothing that was of any use. I'm just running out of ideas, now...

Edited by Cheex, 10 February 2006 - 12:07 AM.

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Scrap that, it's working now. Turns out I hadn't replaced the CPU properly :tazz:

It really helps to read manuals...

Edited by Cheex, 10 February 2006 - 12:43 AM.

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