Then, just run through the other parts in the PC and make sure there’s power running from the power supply to each one. Check to see if your motherboard has an onboard power button. (By this, I mean that it is not even starting the boot; the fan on the processor won't run.) Not all of them do; consult your motherboard manual if you’re unsure or having trouble locating it. It was working fine till yesterday evening, but from this morning, it won't turn on. b. 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 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. 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. If there is not a beep sound, connect the monitor or display and see if any change happens. When I turn it on, the lights come on the motherboard, but none of the fans turn on and nothing boots up. 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. The green light probably means that just the motherboard is powered. c. Remove all the cables connected to the Motherboard ,including LAN cables, audio cables. 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. The CPU socket and motherboard socket have to match so double check that. We simply don't have enough information right now to accurately diagnose the issue. There could be a number of different things going on. Only leave one monitor connected to verify the display. 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. 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. Our Windows 7 32-bit desktop PC is fitted with an Asus P7H55-M LX motherboard. This just gets better and better! My first guess was the PSU. 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. Motherboard on but not booting I have plugged in everything and then turned on my computer according to the instructions for first time boot up. d. Then try to re-boot the computer. Identify Beep Codes. 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