I have a new Corsair Professional AX1200 psu, and I can't get the computer to boot. I have an MSI 890FXA-GD70 with ha 1055Tcpu in it, and an XFX HD 5870 2GB Eyefinity 6 Edition gpu. The trouble is that I have everything hooked up, I've checked connections and everything. When I try to start the computer everything powers on for maybe half a second, it gives off one short beep, and then powers back off. I noticed that my CPU Phase 2 led stays lit up afterwards. I have also tried unhooking different plugs and booting that way, but to no effect, however when I pulled the power cords on my gpu and removed it from the slot the beep was gone, but it still wouldn't boot. Could someone please help me? I've built computers before but I've never had this problem. I'm sure it's something I'm doing and not the psu.
I've already tried each stick in each of the four slots. I'm using two 2gb Corsair XMS3 1600 mhz sticks. I bought this as a pre assembled kit. it already had everything but a disk drive, hdd, and gpu. after looking at the specs of the motherboard everything running 1600 mhz and up is listed as overclocked. could that be it? I've never gone into the overclocking territory, so I really have no clue.
also...I had a friend over not long after I got the computer, and without asking me he went to the MSI website and downloaded a new BIOS for it, which turned out was for the laptop version of this motherboard, I guess. it said laptops only, which he didn't read. but since then when I shut down and boot it up, instead of getting the screen where it says to press the F buttons for commands, it only shows a picture of what looks like the motherboard's box cover. it runs fine, but initial startup from a shutdown takes forever. could that also be the cause? I've considered reflashing the mobo but I've never done it before.