Is the PSU set to the proper setting i.e. 110 or 220... depending on where you live... i doubt this would be it since your getting power... but if you got it on 110 and you need 220 maybe its not giving enough... DONT SWITCH IT IF YOUR NOT SURE
If your in the US it should be 110... i dunno who uses 220 outlets... can anyone help me out here
If your in the US it should be 110... i dunno who uses 220 outlets... can anyone help me out here