Random boot up issues

[SimonMMason]

I have a random boot up issue that happens more often than not.

When starting the PC from cold, the HP post screen shows with the rotating circle. Then the "Your computer ran in to a problem. We'll restart it for you" screen comes up.

Underneath it says "inaccessable boot device"

The PC then restarts and at post I hear 2 long beeps and 2 short beebs. This continues until I press and hold the power button to turn off the machine.

I then press the power button and the computer starts up as normal.

Does anyone have any idea what might be happening and how to fix it?

Thanks. Simon.

[SimonMMason]

Edit:

I had the HD from my old computer in a IcyBox USB caddy. Unplugged it and problem apprently solved.