I would guess that the on board sound may be going out. I have had the sound quality in a desktop computer steadily deteriorate before, ended up just getting a dedicated sound card and that fixed it. I know you cant do that on a laptop, but i dont think this would be a memory problem.
"If I had my way, sporting guns would be strictly regulated, the rest would be confiscated." - Nancy Pelosi Over my dead rotting corpse *****!