Black screen, UMD spins, no sound

Bought PSP 3001. When plugged into charger it starts and the UMD spins up then stops. The screen remains black. Have tried various button combinations to reset with no luck. I don’t hear any sound and the brightness button does nothing. I opened it and re-seated the screen and home bar ribbon cables in case they were loose but no results. Am I missing something? Not sure if it’s a screen issue or motherboard.