Symptom : the motherboard standby lighting remain on but when you press the power button on the casing or the motherboard will not kick start the CPU. I believed the issue here is with the seasonic X750. I was pretty sure it was the motherboard. I've tripled checkedthat the 8 pin and 24 pin power supply cables are connected to the motherboard. 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. Here's the trick: On the back of each stupidly tiny cable, there's a black arrow. Please reply if you have any questions, I'll be happy to assist you. Sothen the mobo might have BIOS but not be able to load the OS. Check to see if your motherboard has an onboard power button. I bought the new Gigabyte mobo last night and installed everything today. Does the HD power up as well? But it still scares me when I hear of all the computer crashes wherein you lose everything. Step 4: Power Button. I'm going to go with dead motherboard. More beeping: "no video card" beep code. I have switched out the power supply, and that too has … Workaround: (use either methods ) 1. I also turn it off for a few minutes and power back on as Mike R does and it works for me too. Since the motherboard kicks in power to the CMOS even before BIOS POST, there’s no way to get a reading from it when the system has power. I have power now but my device fails to perform any functions other than turn on the solid green light on the motherboard, I've followed procedures like unplugging the device and holding the power for 10 seconds but they have all failed. If the hard drive is working fine then by all means connect it … But I hecka like your thought process! Unlikely but motherboards are very delicate and therfore there is a small possibilty you broke when transfering. ( I used to have this issue with my seasonic X1250 previously and had mine rma 3 x ). I have Windows 7 and sometimes it can be frustrating. Somewhere a It can be an issue with the power socket as well, test it on another working power socket too. The next most obvious is to check the power requirements of the new MoBo compared to your power supply. Hope this helps. I unplugged everything (vid card, RAM, IDE drives) and still the same issue. The motherboard lights do turn on when the power is plugged in but nothing happens when I press the power button. I've also tripled checked to make sure the power switch connectors are properly connect to the motherboard. This just gets better and better! Video with Extra Details: You see lights on the computer case, probably hear fans running from inside, and may even hear sounds, but nothing at all shows up on your screen. 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. I came home Friday night to my computer off. I have a separate external hard drive but I have not yet figured out how to smoothly save to it. All PC's, laptops, desktops, towers will always boot into the BIOS without a hard drive.A hard drive, working or otherwise, is not required to get to the BIOS settings screen.. If you are still not able to get the system powered on, then most likely the motherboard has failed, and hardware replacement may be required. You would hear that. When I press the power switch on my case, all I'm getting is the "flicker" of the LED lights on the mobo and the fans will slightly turn and then nothing. Turns out, I’ve seen 10 year old motherboards still working with the original battery. The most common way that a computer "won't turn on" is when the PC actually does power on but doesn't display anything on the monitor. 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. 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