Processor swap no video

[Crunch]

Hi Folks, new to this here so hopefully i post this in the proper
place. :?

This is my problem cpu overheated and i suspect the processor in it
was damaged (burnt sticker on underside).
Motherboard is a ga-7zm it had a 700mhz amd duron processor in it. I
have replaced the processor with a 900 mhz duron and new heatsink fan
however once i try to boot up with the new chip i recieve no video
signal to the monitor. With the old damaged chip the comp will
boot fine.

Is there something i am overlooking here to make this new chip work?
or is the new processor (purchased used) no good?

Last question is the a way to properly test the old processor to make
sure is was or was not damaged from overheating?

Thanks in advance
Crunch

 

[Noozer]

How do you know that the CPU overheated to the point of failure?

I've seen several paper labels on the underside of a CPU turned brown from
heat even though the CPU never overheated at all.

 

[Crunch]

How do you know that the CPU overheated to the point of
failure?

I've seen several paper labels on the underside of a CPU
turned brown from
heat even though the CPU never overheated at all.

thanks for the reply, i can not tell for sure if the chip overheated
and have not been able to find a way to test it as yet other than
using it of course. This computer does have some other errors
however i`m pretty sure those are o/s problems. The original chip
does boot up fine and seems to run well for the short time i have used
it, the replacement will not produce any video signal. That is where
i am stumped.