My PC isn't working. CPU fan spins, monitor shows 'no signal'

Hello,

I have a desktop PC with Windows 7 Ultimate, Intel i3 4th gen processor 4130 (with inbuilt Intel HD graphics 4400) with a 4 GB RAM and no separate Graphic Card. I usually use it for gaming purposes.

The other day I tried to power it on; the monitor powers on, CPU fan starts spinning and power lights are on - BUT monitor shows "No Signal". Tried pressing Caps Lock, but the Caps Lock light on the keyboard doesn't toggle on/off so the machine ain't booting. OK then what's the problem, is it the board?

I tried cleaning the RAM slot and re-inserting it. I also tried @bionik 's "magic trick", it ain't working either. Any solutions to this problem? Please help.

Thanks!