Odds are the heatsink was cooling a transistor. 
broken transistor means no more working device.
you may want to try soldering the broken pin back into place.
you may have caused more damage though, and the machine may never function again.
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Athlon 64 3000+ (Venice) @ 2.4Ghz (267x9) stock vcore on a ChainTech VNF4 Ultra (7-19 BIOS)
Kingmax 512MB DDR 466 x2 @ 480MHZ 7-3-3-2.5-1T, GeForce 6600 PCI-Express
1 160GB, 1 80GB, 4 200GB (on SATA) and 1 DVD Dual writer
All housed in a circa 1997 inwin case hacked into the flipped BTX style
Air cooled, First time since 2001. It's not noisy, what's wrong?
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