CPU bleeping constantly.

Question

After being moved my grandsons computer when put back on bleeped constantly. Tried all the leads - changed them over to his sisters who has the same set up but to no avail. Could dust in the CPU do this or do you think something inside has become dislodged.

The monitor just come on (blue light) says Acer and then no signal and then the light turns orange. Still the bleeping goes on.

Help. A Nanny in distress...