When i switch on the pc monitor is black and cpu is automatically gets on and of

[prabhu_37]

when i switch on my pc,it never starts and the light in the cpu is getting on and automatically off,how it can be solved

 

[Emerald]

what kind of computer is it?

does the light blink on the Monitor or the Computer

 

[accolite]

Have you messed with any hardware on it or did the problem just appear out of the blue?

Try resetting your bios by pulling the battery out of the mother board and back in.
Should look like a watch battery but the size of a @ nickel.