MkIII box no lights dead

[hindibuff]

Hello,
I know what I did to screw up the box so here goes. I accidentally plugged in 12 V cable into the box instead of it's 5V adapter. After that, the box is completely dead. No lights, no led nothing. Inspecting the PCB does not show any obvious signs of burnout. Just wondering if anyone has any suggestions on what to do or it might not even be a case of bunout. Any ideas would be greatly appreciated.

Thanks

[Kentril]

Try Voltmeter if power goes to motherboard. I suppose Powersupply is dead.