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. The CPU socket and motherboard socket have to match so double check that. Only leave one monitor connected to verify the display. 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. Identify Beep Codes. Our Windows 7 32-bit desktop PC is fitted with an Asus P7H55-M LX motherboard. 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. 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. b. My first guess was the PSU. Not all of them do; consult your motherboard manual if you’re unsure or having trouble locating it. Check to see if your motherboard has an onboard power button. 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.) 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. Remove all the USB devices and external cards from the motherboard, including the mouse, keyboard, USB flash disk, SSD, external PCI-E Cards, etc. The green light probably means that just the motherboard is powered. It was working fine till yesterday evening, but from this morning, it won't turn on. 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. 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. 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. We simply don't have enough information right now to accurately diagnose the issue. 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. There could be a number of different things going on. d. Then try to re-boot the computer. If there is not a beep sound, connect the monitor or display and see if any change happens. This just gets better and better! 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