Dell n4010 no power after hdd replacement!

[lourendo]

So i was fixing a friends laptop and after replacing the hdd there is no power whatsoever. the hdd is mounted to the mobo and ive done dozens of similar replacements and never had a board die in my hands. what do i do? Do i have to shell out the cash for a new mobo? ive made sure all connectors are connected. I was planning on returning it tomorrow so i would appreciate your advice, Thank you.

 

[o1die]

Have you tried the old drive again to see if it gets power?

 

[lourendo]

yes. tried that. put the new one back in. tried again. then visually inspected the mobo. reassembled and tried again. it worked. I dont know what happened. any theories. probably the 10th time ive had it apart and back togethe but it just randomly started working? bizzare