Question Pc not booting after processor change

Jan 27, 2021
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Hi guys,

I am non techie, would need expert advice and help.

I have Dell optiplex 9010 SFF with i7-3770
I changed the processor to i5 -3470 and it stopped booting. When i try to start amer light flashes once with small sound and then it shuts off, after few seconds it happens same.
I tried cleaning ram also but still the same.

I checked the psu diagnostic with button on back, i can green light on pressing the button

Please help, Thanks.