Damaged Mobo or CPU ?

My system:

AMD 64 3200
Nvidia 6800
PC2100 512MB RAM
40GB HDD
Gigabyte K8VT800M
New 550 Antec TruePower PS

Yesterday I received new power supply and a new cpu fan with heatsink

Installed the power supply, checked everything..computer ran fine, boot up and all...

Then I started replacing cpu fan (doing it 1st time)...when I got fan+sink off, cpu came off with it....thermal paste was sticked to the heatsink with cpu...and looks like I pulled cpu off the socket without releasing that thing that goes on socket (you lower or upper it if you want to release/place cpu)..

Cpu didnt seem damaged, looked fine and no visible damage...so I put it back in, put new heatsink fan, put everything back together - and COMPUTER DOES NOT BOOT...no CMOS screen, nothing..Power turns on though...I can see CDROM's light flashing, then I can see greenlight on my case light on..also when I power on I see yellow light for a couple of seconds and than it goes off...Did not see any HDD lights coming (red one)...

I think Ive messed up my CPU...I also tried changing video cards - did not work...

Do you think my CPU needs a replacement or I did something worse ? Is there any way to check that before I go spend 200 bucks on CPU ?

Please help!

(^^;(Ultimately you cannot but test CPU on another board.)

Before this you may check CPU and its whereabouts once again. Check carefully whether any pins are damaged or not and whether it is smoothly seated or not.

Then as usual, make it minimum, cmos clear and observe and feel anything.

Hello, I have the same problem with my PIV system. About 7/8 of the time, no post, or anything, except the blinking cdrom lights, and cdrom noise like they are trying to find shut the doors. I may have to power cycle many times to get it to boot. So far it has always booted eventually. I have reseated the CPU and so on, and it seems to be fine. System is stable for extended periods of time once it is up and running.

PIV 3.2 GHZ
2GB DDR 400 RAM
intel 875 chipset