Hello all,\n\nMy friend has an EP-9NPA+ motherboard. He is currently running with\nan nVidia 6600GT video card. When I went to upgrade the card to a\n9600GT, I got a C1 error on the board. My first thought was not\nenough power. He currently has an Antec SL-350S power supply. I have\nan Antec SP-400 power supply in my PC, so I swapped that out with his\nPS to test. Still a no go. I put his old 6600GT card back in, and\ntry to boot again with my SP-400 power supply. I get the blue LED on\nthe board to light up, but when I hit the PC power switch nothing\nhappens. When I put his SL-350S power supply back in, it powers on\nfine.\n\nNow here's the weird part. When I plug in the old SL-350S power\nsupply and flip the power supply switch on, the fans, blue LED, and\nLED displays on the board jump for a second which gives me the\nimpression they have juice. When I plug in the newer SP-400 power\nsupply and flip the switch, that doesn't happen (and the board won't\npower on). The SP-400 still works with my PC, so it isn't dead.\n\nMy first problem is figuring out why my power supply won't power the\nboard. I don't want to upgrade his power supply only to find that the\nnew one won't turn the PC on for some strange reason. Does anyone\nhave any idea what might be going on?