Remove all dongles and USB peripherals.
Flip power switch on/off then back on (or unplug and plug back in)
Hold power button till it turns on, keep holding till it beeps, keep holding till it powers off and the green light turns red.
Hold power button again till it turns on, keep holding till it beeps, keep holding till it beeps twice consecutively and let go.
If your hdd is working the menu will pop up, try restoring databases. If this menu doesn't show up more than likely your hard-drive has bit the bullet.