Ok last night I switch off the pc, with no problems. No installs or anything that day. Today I switch on and the sound has gone mental...all I get is white noise/hissing at max volume level. I have done the following to see if I could find the problem: checked all connections removed the driver and re-installed the driver a few times updated the driver - was already at most recent replaced speakers with old set - still only loud hissing at max volume checked bios - all enabled system restore - no change I even tried the front audio sockets - no change No conflicts in Device manager The sound card is an onboard card Cmedia 6501, on an asus board. Board: ASUSTeK Computer INC. M2N-SLI 1.XX C-Media CM6501 Like Sound Device Driver version: 5.12.08.1803 I'm thinking it is a software fault, but apart from re-installing the drivers I'm not sure how to resolve this at all. Can anyone help please?