Is this a faulty Mobo or PSU? PLEASE HALP

Hey guys, I've been having some problems with my new build lately. I'll just list the specs first.

Asus P8H67-M PRO

Intel i5 2400 3.1GHz Sandy Bridge CPU

2x4GB Corsair Vengeance DD3 1600

CoolerMaster Extreme Power Plus 550W

Sapphire Vapor X HD 5770 1GB

500GB hard drive and asus cd/dvd drive

The problems I've been getting are numerous. First, the Channel B RAM slots dont work. I know that the RAM is 1600 and the mobo supports 1333 but shouldn't they still work? I tried putting in both sticks for dual channel mem but my PC won't post and I get no signal on the monitor. I tried using just one stick in Channel B but I get the same problem. So right now I'm using a ram stick on the Channel A slots closest to the CPU.

Also, my GPU is not working. I plugged it in, checked the power connectors and everything, but I also don't get a signal. The GPU and everything else turns on, but strangely I can hear Windows 7 load up but I can't see anything. I've tried HDMI, DVI and VGA to no success. I checked my BIOS and all the settings are right too. But either way I've sent it back for a refund ( I thought it was the GPU first that was bad).

Another problem is the random rebooting the PC does. Whenever I turn it on, whether I've disconnected the power cable and reconnected for a fresh start up, the PC starts up, then after 5-10 seconds it reboots, and it doesn't post either. When it reboots, a red LED light stays on for the RAM, so I click on MemOK for the mobo to fix the ram issue. Once that happens, it reboots and starts up again.

Can anyone help me out here? I'm thinking it's either the PSU or the mobo, or both. The PSU is 70% certified, but it should be able to handle everything IMO. But I guess the random restarts are caused by it.

Please give me some ideas. I'm thinking of sending back the mobo and PSU and two new ones instead.

I'm going to post these up in the motherboards section too just in case.
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  1. Hi osmanf, I'll see if I can help you.

    So when you connect to the 5770, are you still outputting video to the onboard? Is there an option in the BIOS to switch from the onboard video to a discrete card?

    Do you understand that all modern boards will do the double-post thing when they have lost power? I don't fully understand why myself but they do.

    The CM PSU could be an issue. Cooler Master makes great cases but they don't sell many good PSUs. Yes they have a good line or two but all of their cheaper PSUs are actually overpriced and frequently over rated... as in not able to deliver the stated wattage.

    You do need to manually adjust your RAM settings in the BIOS to match your RAM. This may resolve much of your problems.

    Download and run CPU-Z to discover your 1333Mhz timings and voltage (info will be found in the SPD tab). Then make those adjustments manually and see if you can't get both sticks working. If not, then bump the voltage to the DIMMS slightly and try again.
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