Yep. Common mistake. Most modern motherboards require power to the board and the CPU. Be sure to supply power to any graphics cards that require it. Mine requires two PCIe connections. Also make sure your RAM sticks are in the correct bays if your motherboard supports dual-channel memory. Good luck. Sounds like you are on your way! Yipee! YOU BET!
Was a little disappointed. I've now used both PCI-e (6+2) connectors for my 5850, and both 4 pin connectors for the MoBo. Was hoping to crossfire another 5850 in without replacing PSU but the TX-650 doesn't seem to have enough connectors. Only Molex and SATA connectors left
Up and running, drivers up to date, everything looks ok. Noticed that I left it on last night (downloading some game clients) and it shut down automatically overnight. I'll have to keep an eye on it.
Going to get into overclocking now. I'll update once done.