Should be. The only problem that I see MIGHT happen is if the bulbs draw too much current and pull the voltage down on the hard drive. I doubt this will happen, but if the computer does weird things, but returns to normal when you remove the bulbs, then it will be a problem. If this happens, you may have to swap the bulbs out for LEDs, which draw quite a bit less current than incandescent bulbs.
There are several online shops that sell leds that directly replace incandescent bulbs. Holler if you need some links to them.