Computer wont turn on after cpu upgrade

[kirkpotatocar]

I upgraded my cpu and when I try to boot my system it would turn on then after half a second it would turn off. I tried to put my old cpu back in my computer and it would do the same thing, any suggestions on what to do?

 

[J_E_D_70]

Would help to have specifics on computer parts but might have bent a pin trying to put the new cpu in. Would explain why old one now doesnt work.

 

[kirkpotatocar]

Would help to have specifics on computer parts but might have bent a pin trying to put the new cpu in. Would explain why old one now doesnt work.

i have a gtx 1060, i5 8400, gigabyte ga-b250m-ds3h, 750w corsair power supply and 16 gigs of ram

 

[J_E_D_70]

What was the old cpu?

Edit: you cannot put an 8th gen cpu into a 6/7th gen board. Thats why 8400 doesnt boot.

 

[kirkpotatocar]

What was the old cpu?

A pentium g4400

 

[kirkpotatocar]

Well why wont the old cpu work?

 

[J_E_D_70]

It shouldn't have damaged anything so not sure. Again - maybe bent pins? Could also try a CMOS/BIOS reset.