Normal
Can you replicate the the problem with the case sides open? Look and see what moves as you turn the case.Try jiggling various cords. Look for a bad cable with an internal short.-External power-Power extension-Reset cable-Power cableUnplug the reset cable.Use a different power switch, or just short the pins for power.Longer shots:Possible bad solder on the header pins?Possible issue with flexing motherboard?
Can you replicate the the problem with the case sides open? Look and see what moves as you turn the case.
Try jiggling various cords. Look for a bad cable with an internal short.
-External power
-Power extension
-Reset cable
-Power cable
Unplug the reset cable.
Use a different power switch, or just short the pins for power.
Longer shots:
Possible bad solder on the header pins?
Possible issue with flexing motherboard?