Technical Support MacBook Pro A1278

[pankajbiyani]

I have MacBook Pro A1278
Part no.820-3115-b white light and beep problem laptop start but not display coming, I replace ram,and bios program and i check ram voltage available 1.499
Please help me

 

[Ahmad Safari]

Check the voltage and see if all the voltages are present correctly?
If the voltages are correct, there is a high possibility of cold soldering of the graphics.