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Request for help on diagnosis / troubleshooting the following weird issue- During routine flights, usually after about 30 mins or so, my Windows 7 box will suddenly freeze up during FSX and a LOUD BUZZING SOUND will come from the speakers (not the PC). Onscreen, the FSX in-flight image is frozen in time... (NO BLUE SCREEN CTD) Here is the sound, in MP4 format. It gets a bit louder after a few seconds because I moved the MIC closer to the speakers. Clues: GTX690 dual-GPU vid card with WHQL drivers (latest) from nVidia card is now running in SLI mode (possible suspect) 3-D is OFF Onboard Sound Card (ASUS P8P67 Pro mobo) All latest Win7 updates/patches/SP's 64bit Suspects: REX ESSENTIAL Note: After this hard crash occurs (no blue screen - system is totally froze up and the loud buzz continues until I do a hard reset), REX won't work properly following this phenomenon and must be reloaded. This suggests to me that something within REX gets corrupted during this entire process. EFB (Electronic Flight Bag by AivlaSoft) I doubt this is the culprit, since it's running, I'm listing it. I did download the revised Navigraph AIRACC version -2- (specifically for EFB) Still have the problem. Squawkbox 4 running in Windows 7 Compatibility Mode. CORSAIR AX-850 Power Supply, apprx 11 months old. While I have never had a problem with this PSU, I have read of others who experienced the hard system lockups who eventually ran it down to a power supply. I have sent a copy of the recorded noise to Corsair support. This noise comes from the computer's audio system, not the little midget speaker on the motherboard. I must cycle the AC power to clear this lockup. NOT a crash to desktop. I am almost wondering if the SLI mode is sucking more power from the power supply unit - possibly this PSU can't handle the extra draw of BOTH gpu chips under heavy load. I am just throwing thoughts into the wind. I only recently turned on SLI-mode (multi-GPU mode), formerly it was running problem free in single GPU mode. What I've tried with no success: Turned down overclocking from usual 4.8 Ghz to 4.7. No difference. Tried running SB4 in Windows 95 compatibility mode No difference. If anyone could kindly listen to this loud buzz and put forth a path to troubleshooting this I would be grateful for the assist. This is a someone new issue. I don't remember having the problem before REX ESSENTIAL, but that's my old-man memory, might be something else. I would almost suspect a driver issue, but darned if I can figure out which device is the problem child. Thank you all in advance.