I've been having this problem ever since (well started about 3-5 days after) I installed a new sound card - Asus Xonar D1. PC just restarts randomly. Sometimes during games, other times just when I browse the net. Here's a short snippet from the minidump: MACHINE_CHECK_EXCEPTION (9c) ... BUGCHECK_STR: 0x9C_AuthenticAMD CUSTOMER_CRASH_COUNT: 1 DEFAULT_BUCKET_ID: DRIVER_FAULT PROCESS_NAME: Idle LAST_CONTROL_TRANSFER: from 806e9bfb to 804f9f43 STACK_TEXT: 8054e5c8 806e9bfb 0000009c 00000000 8054e5f0 nt!KeBugCheckEx+0x1b 8054e6f4 806e4c52 80042000 00000000 00000000 hal!HalpMcaExceptionHandler+0xdd 8054e6f4 00000000 80042000 00000000 00000000 hal!HalpMcaExceptionHandlerWrapper+0x4a STACK_COMMAND: kb SYMBOL_NAME: ANALYSIS_INCONCLUSIVE FOLLOWUP_NAME: MachineOwner MODULE_NAME: Unknown_Module IMAGE_NAME: Unknown_Image DEBUG_FLR_IMAGE_TIMESTAMP: 0 FAILURE_BUCKET_ID: 0x9C_AuthenticAMD_ANALYSIS_INCONCLUSIVE BUCKET_ID: 0x9C_AuthenticAMD_ANALYSIS_INCONCLUSIVE Followup: MachineOwner Just tell me the first thing that comes to mind guys and I'll try it. P.S. I've been thinking of removing the new sound card and going back to onboard for a couple of days just to check. Also OS re-installing crossed my mind too. I tried: 1) Driver reinstalling. 2) Checked Device Manager, no exclamation marks or conflicts. 3) Not overheating, haven't done any oc or the like around the time this started happening.