NO Boot, but power on the board

I've Intel G33 board and WD HDD with 2GB RAM. nVidia GeForce9400GT express Graphics card. I unplugged the HDD and plugged it back again after a week but the is no boot and I've power on the board

Check first your connection with your harddrive both power and interface. Could be you interchange the interface cable.

Or test your unit without the harddrive if it will boot. If this Post then your problem is with the drive.

If not check your RAM card reseat or clean its edge connector with soft eraser.

For the meantime this is what I suspect that is causing the problem.