My new Computer turns off and on by itself
Just bought a new computer i5 750 w/o the graphics card or OS. I installed a GTS 250 and turned on to install Windows, but the computer turns on for about 15 seconds and then shuts off by itself for a period of about 5 seconds. Then it starts by itself again and follows the same pattern. There are no warning beeps, and I checked every single cable to make sure they are properly connected.
I tried it by removing the graphics card, I removed one of the memory sticks, removed both, pluged in the computer to a different outlet, and all the basics. Everything is new in the computer and I doubt that this is caused by the power supply. I think this is more related to the mobo. I have an AsRock P55M Pro
Any leads on what this could be from some of the experienced guys?