motherboard light on but computer not starting

There could be a number of different things going on. If there is not a beep sound, connect the monitor or display and see if any change happens. Only leave one monitor connected to verify the display. Whenever I press the power button the fans all spin, four lights turn on and stay lit on the motherboard but the PC doesn't actually start. Remove all the USB devices and external cards from the motherboard, including the mouse, keyboard, USB flash disk, SSD, external PCI-E Cards, etc. Then, just run through the other parts in the PC and make sure there’s power running from the power supply to each one. (By this, I mean that it is not even starting the boot; the fan on the processor won't run.) We highly recommend that you test your computer with a Power On Self Test card to confirm that the motherboard is the cause of your computer not turning on at all. c. Remove all the cables connected to the Motherboard ,including LAN cables, audio cables. We simply don't have enough information right now to accurately diagnose the issue. d. Then try to re-boot the computer. If you get a series of beeps, check the motherboard or computer documentation for the information on beep codes or go to this post from computerhope - Computer POST and beep codes to know much. b. The green light probably means that just the motherboard is powered. The CPU socket and motherboard socket have to match so double check that. Our Windows 7 32-bit desktop PC is fitted with an Asus P7H55-M LX motherboard. Check to see if your motherboard has an onboard power button. I've got the POST test card now and some of the lights stay lit on it but it doesn't seem to show any codes just four lines in the led display where the codes are meant to be. Identify Beep Codes. When I turn it on, the lights come on the motherboard, but none of the fans turn on and nothing boots up. Not all of them do; consult your motherboard manual if you’re unsure or having trouble locating it. Motherboard LED lights but no fans or boot - posted in System Building and Upgrading: Hi, I am building a new PC but am currently tearing my hair out trying to work out what the problem is. This just gets better and better! If your PC won’t turn on but motherboard light is on, a potential culprit is the power button on the case itself or the wires connecting that button to the motherboard. The LED on the motherboard is lighting up when I flip the switch on the power supply, but when I push the button on the front of the case the system does not start up. If the new case came with all the "braids" for connecting cables then you should start by making double sure everything is plugged into the right slot with the exact compatibility. It was working fine till yesterday evening, but from this morning, it won't turn on. My first guess was the PSU. 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