AMD FX-8350 (eight core) 4.0 ghz>>
Asus M5A99FX Pro R2.0>>
ADATA XPG Gaming 2.0 16gb DDR3 2x8Gb 2400 MHz>>
2 x MSI Radeon HD 6790 OC Video Cards (Crossfire)>>
WD 600 Gb Velocirapter (System)>>
WD 600 Gb Velocirapter (Work Disk)>>
WD 600 Gb Velocirapter (Flight Programs)>>
Ultra Gladiator Mid Tower case (case fans replaced with Cougar Vortex
Antec Cooler H2O 920 (2 x fans replaced with Scythe Gentle Typhoons)>>
Windows 7 x64 Ultimate>>
I had to do some cable maintenance and change out a couple of the hard drives for 1TB Velociraptors. Had some problems with the Catalyst 13.9 driver in FSX, so I deleted the old drivers and installed 13.4, everything worked fine for a couple of days. When I booted up this morning, motherboard beeped to let me know that "no video device installled". Removed the Crossfire bridge and removed power to the second video card - system booted, went into windows - all ok. Reconnected the second card, moved video cable to second card, removed power to first card. Booted system, went into windows - all ok. Checked drivers. Reconnected first card and booted - 1 long beep and 3 shorts - "no video device installed".
Anyone have any idea how I start troubleshooting this?