PC Won't Power in After Moving it to new chassis

[VietKing]

Got a new case for my pc. Moved it into it and now when I press the power switch nothing happens. The debug light, lights up for a millisecond under Dram, GPU, and Boot drive. But nothing turns on and it only does the debug light once before I have to unplug it for it to do it again. Everything worked fine when I had it in the old case this morning

[Letgomyleghoe]

check all your power connections, and your front panel power header connection

[VietKing]

11 minutes ago, Letgomyleghoe said:

check all your power connections, and your front panel power header connection

Just checked them again and everything is tight and snug. 

[johnny5c]

Check that a standoff isn't in the wrong hole on the motherboard tray and causing a short.

[VietKing]

5 hours ago, johnny5c said:

Check that a standoff isn't in the wrong hole on the motherboard tray and causing a short.

Checked all the standoffs. The P400a comes with a standard atx standoff so nothing ahlookuld be wrong

[Tan3l6]

Take the stuff out and test it on the bench maybe?

[VietKing]

14 hours ago, VietKing said:

Got a new case for my pc. Moved it into it and now when I press the power switch nothing happens. The debug light, lights up for a millisecond under Dram, GPU, and Boot drive. But nothing turns on and it only does the debug light once before I have to unplug it for it to do it again. Everything worked fine when I had it in the old case this morning

Okay found the problem. One of the PSU cables was from a different PSU and didn't work with this one.  Removed the cable and it worked