Upgraded memory now computer wont start

[Dncngfl]

Upgraded memory but forgot to unplug computer. Now computer wont start. no sounds .. no fans...nothing.
Replaced old memory still nothng. Checked all power supplies..nothing. Green light slowly goes out on back after unplug but turns on after power plug reinserted. Any help??

Had upgraded other pc before just stupidly forgot this time.

 

[treefrog07]

Time to consider replacing your motherboard.