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I changed my cpu and now i have a stedy yellow light on

i have a dell optiplex gx620 tower with a 3.0 pentium d cpu i a bought a q6600 cpu from a friend and installed it now the tower wont turn on i have a steady yellow light on no beeps the dvd drive light up and works do i have to reset mt bios ?
i have a dell optiplex 755 with the same motherboard number and the same cpu so i thought i would put this cpu i didnt move any memory or power supply in the old cpu came out620 so i put the original cpu back n it works fine starts up is the cpu bad or not compatable how can i check if the cpu is good i grounded myself good and lapped the cpus with artic silver 5 paste i installed it the same way the old one came out any answers i would appreciate it thanks again mike
3 answers Last reply Best Answer
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  1. Best answer
    the opti 620's don't support any core2 based CPU's. The 620's are too old. Sorry.
  2. Best answer selected by lilzauf.
  3. actuallthe dellgx620 does come wi dual core but your motherbord has to be dual core compliant
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