If it's not seated properly, the PC won't boot. I don't see how a heatsink could exert too much pressure on it, unless you've over-tightened the screws holding it in place. Not sure in that case, but I don't think you can damage a CPU in that way.
Yeahh it turns on, but gets to the "Starting Windows" page on Windows 7 and reboots. I cannot boot from the installation disk because my machine just reboots itself after the installation files have downloaded
HDD failure anyone? when booting from the installation disk is the bios set to boot from DVD/CDrom? what HDD are you using and what mode in bios is it in, i.e. ide or achi or raid, have you installed the drivers, or is it failing before that point.
Yes it is set to boot from DVD, but once loaded the machine just reboots.
I'm using a Western Digital Hard disk, but I am not sure one the make of it.
BIOS is in IDE
And yes the drivers are installed
The machine was working fine. I left it downloading a game from Steam, came back after a few hours later and it said the machine had to reboot. Now it won't boot from hard disk, as it keeps rebooting. It does the same with booting from a DVD, and I also can't boot from Safe Mode, as it attempts to load the core basic drivers, and then reboots.