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.. The motherboard lights do turn on when the power is plugged in but nothing happens when I press the power button. 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. I have Windows 7 and sometimes it can be frustrating. Hope this helps. More beeping: "no video card" beep code. I unplugged everything (vid card, RAM, IDE drives) and still the same issue. I'm going to go with dead motherboard. Step 4: Power Button. Check to see if your motherboard has an onboard power button. 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. 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. I believed the issue here is with the seasonic X750. 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. 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. Turns out, I’ve seen 10 year old motherboards still working with the original battery. You would hear that. If the hard drive is working fine then by all means connect it … This just gets better and better! 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. Workaround: (use either methods ) 1. I've tripled checkedthat the 8 pin and 24 pin power supply cables are connected to the motherboard. But it still scares me when I hear of all the computer crashes wherein you lose everything. I bought the new Gigabyte mobo last night and installed everything today. Unlikely but motherboards are very delicate and therfore there is a small possibilty you broke when transfering. 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 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. Somewhere a Video with Extra Details: I was pretty sure it was 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. I've also tripled checked to make sure the power switch connectors are properly connect to the motherboard. I also turn it off for a few minutes and power back on as Mike R does and it works for me too. The next most obvious is to check the power requirements of the new MoBo compared to your power supply. I have switched out the power supply, and that too has … I have a separate external hard drive but I have not yet figured out how to smoothly save to it. Here's the trick: On the back of each stupidly tiny cable, there's a black arrow. Does the HD power up as well? 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. I came home Friday night to my computer off. ( I used to have this issue with my seasonic X1250 previously and had mine rma 3 x ). 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. 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