Asus 5224A noise problem

my Asus 5224A makes the most awful noises all the time. itz like a groaning, grinding sort of noise. especially when i insert any cd-rw discs, but generally it does it all the time. i have flashed it with the latest firmware, itz 6 months old, and been the most retarded cd-rw unit i have ever known ! it reads and writes very erractically (it revs up and slows down all the time) . i have all the latest mobo drivers and my system is perfect,eg., i installed a friend’s cyberdrive 52x24x52 to test things out and it ran SO much better. any ideas ?