Please see profile for setup (Windows XP Pro SP2) I use this puter for gaming mostly and had been running Crossfire (2 GPUs) for a while. My issue is as follows: (this is a post I have submitted with ATI support) Ticket Description Type of Inquiry: PC support Bus Type: PCI Express Operating System: WINDOWS XP SP2 Other Operating System: Driver Version: Driver Version: CATALYST 6.12 Other Driver Version: Category: Solve a Problem Topic: Display Graphics Manufacturer: Sapphire Technology Ltd. Product: Sapphire Radeon X1900 XT 512MB PCI-E Crossfire Ready Summary: No video being displayed Details: I have a custom PC running AMD X2 4200, XP Pro SP2, ASUS Mobo,550W power, X1900XT (Saphire) & X1900 (Master card) running in crossfire mode... well WAS. It all started when I powered down PC to disconnect DVI connector cable between monitor & master card. I hooked up a VGA cord to monitor to run a different (older Dell) computer. after this I reconnected the DVI cable to card and monitor...No display. I disconnected cable from master card and connected to slave direct (still in crossfire mode) no video. connect cable to free DVI port on master, I get video and notice in catalyst that crossfire was disabled and cannot be re-enabled. Try to connect to dongle, no video. reboot computer, now no video from any port on master or slave. end result: no video period. I tried all cable configurations, no luck. These cards are new, I spent a ridiculous amount of money and now I'm praying they are not dead (thought fans are turning and lights are on on cards)just no display. I doubt highly its my monitor because thats not very old either (Dell 24" Wide Screen LCD)Is there a key combo I can do on boot-up to reset something? Also I do not have the CDs that came with cards; I got most recent drivers from ATI website. Please help! Update! I went home onbreak and did a reboot and the cable in the master card DVI slot again and it worked! I have video and kept my comp running so that I don't lose it again. I went into the Catalsyt controls and reset all factory settings just in case. So far thats all I have done since my post. Still waiting on reply. I would like to determine whats wrong (if anything) with the slave card and get back to Crossfire mode eventually. Your help is much appreciated!