PC shut down immediately no boot screen

heshand

Honorable
Nov 9, 2013
1
0
10,510
please help,

My pc shuts off immediately when power on, cpu fan starts but after the beep its shuts off, no screens appears i cleaned the MB and placed card board under MB to prevent shorting, also i removed ram then it gives ram warning beep it seems MB is detecting ram. and i changed the cpu fan also no results please help, what could be the problem?

thanks.