My Specs: Processor: Intel(R) Pentium(R) 4 CPU 3.20GHz (2 CPUs) Memory: 1024MB RAM Hard Drive: 203 GB Video Card: Radeon X1950 Pro Monitor: SyncMaster 226BW Sound Card: Realtek AC97 Audio MB: Asus P4P800-E Deluxe Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158) I have recently formatted my pc and a problem has arised. I have purchased COD4 and when I play it for about half an hour or so the sound just cuts out and does not come back on unless i reboot the pc. I have completed the following steps: Updated all the latest Drivers from realtek. Speakers are all correctly connected. Volume is turned up all the way and not muted. Correct Audio Device is selected. There are no exclamations next to the devices in device manager. I have Directx9 installed. I have searched all over the web and cannot find anything to solve my problem. Help would be much appreciated. Thankyou.