CPU booting problem

My CPU has problems but I don't know what/where the problem particularly, this just happen since last week, I have this CPU for 2 years.

When I turn on the CPU, sometimes it doesn't display anything.. It just say No display then sleeps the monitor, but the CPU is still running and PSU is still up.. The OS didn't boot either. There's only a chance when I turn it on and it boots up and I can use the computer until I shutdown/turn it off, I can use it normaly when it is and there's no problem like it shuts down by itself, but when I turn it on again, the problems happen again..

Anyone experience this? Is this hardware or software? PSU? MoBo?

Help please.. :(

My problem is video display so I can post it here, can't I? What I mean by CPU is the whole CPU, the whole unit.justin4444

The same thing happened to me over the past couple of weeks: either the computer wouldn't boot up at all or if it did it would often not have any video. It turned out to be a bad motherboard. I replaced it and everything works fine now.Bane_v2