When i start my pc up its switches back off ?? Tags: Prebuilt Systems Last response: February 7, 2012 10:55 PM in Systems Share paulp300 February 7, 2012 9:37:33 PM it starts up and switches back off , gose on and on .?? More about : start switches back omega21xx February 7, 2012 10:25:39 PM Bad PSU more than likely, unless you have another failed component keeping it from posting. m 0 l pjmelect February 7, 2012 10:51:15 PM More likely it is the power supply, but you should also check that the CPU fan is running and that the heatsink is fixed securely. m 0 l Can't find your answer ? Ask ! Get the answer omega21xx February 7, 2012 10:55:31 PM You may also have a fine PSU and just not enough power from it to power components, give us some specs of the psu and computer. m 0 l Can't find your answer ? Ask ! Publish Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !