My computer: Thermaltake 430W PSU Chaintech 7NIF2 Athlon XP 2400 2 x 256 pc2100 80GB Western Digital ATI Radeon 9800 Pro Situation: I just replaced the chipset cooler with a Zalman NB47J and when I assembled the computer back together, I just got a 4 second beep that repeats and the monitor was blank. No BIOS screen or anything. Heres what Ive tried so far: *I thought it was because of a misconfiguration of the front panel connector, so I looked up the manual and put the cables as they should be. I tried various configurations with no luck. *I tried clearing the CMOS and also taking out the battery. *I disconnected/removed any cards or disks, just leaving the motherboard, fans, and memory. *I tried booting with each ram stick individually and also put them in opposite slots. *I connected the monitor to the integrated graphics instead of my ATI card. My dad thinks its possibly fault of the Zalman heatsink. Should I try putting back the previous cooler? Any other suggestions? P.S. I dont think the PSU is at fault. Its fairly new and should provide enough power.