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Changed Heatsink - PC doesn't boot anymore.

My computer started shutting off on its own. It happened 3 times before I cued in.
I installed HWMonitor from CPUID and it said the AUXTIN temerature had a high of 170C even though at the moment it was at around 70C.

Thinking it's a cooling issue I looked at the heatsink and one of the 4 legs pinning it on the CPU was broken, thus making a less than perfect contact.
So I bought a new heatsink of similar grade, applied a new coat of thermal paste and put it back together.

Now when I start my PC I don't get any video. I just tried another video card and it's the same problem so I don't quite know how to proceed from here.
No beeping, and the monitors say Check Signal Cable.

The motherboard doesn't beep.

Specs
I can't be more specific without booting the thing and checking the system info. It's an older machine so I don't have the papers anymore.
Mobo: ASUS P7P55D-E-LX
CPU: Core i5
Heatsink: Deep Cool HTPC-200 (About the same size as the old one)
Video: Asus card. I think it's 1Gb and it takes a single additional PCI-E power input.
PSU: Stealth XTreme 2 500W
RAM: Corsair Vengeance 4x4Gb

Thanks,
Reply to eregimbald
2 answers Last reply Best Answer
More about changed heatsink boot anymore
  1. Best answer
    It seems that your motherboard or processor died, since you tried a different videocard and it did not work. To make sure, you will need to test these components.
    Reply to John Philips
  2. Are you positive your cooler is compatible with your cpu/mobo and that it is sitting tight against it?
    Reply to Sedivy
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