![]() For example, a frayed wire might be brushing the motherboard, or a portion of the case may be touching a component. If your system powers up, the fans spin, the lights turn on, and then everything turns off after half a second, only for it to repeat in a never-ending loop, there may be something metallic shorting out the system somewhere.Ī short occurs when a component in a system creates an improper electrical connection between components. Whether your system gives you a useful error code or not, though, there are still a few different fixes you can try to sort the problem out. Each manufacturer uses different indicators to tell you what the problem is, so you’ll need to refer to your documentation to translate the error code on your machine. Some of them can be as mundane as you forgot to plug in a power cable, while others will tell you that your CPU is damaged and needs replacing. If turning your system off gives you a series of particular beeps, or your motherboard has a display on it that shows a particular error code, use your motherboard’s manual to diagnose the problem. Many modern motherboards will give you an idea of what’s wrong if you know where to look and/or listen. Ideally, you’ll have an anti-static wristband in hand, but if not, make sure your system’s PSU is turned off (it should be when you’re working on it anyway) and periodically touch the case to ground yourself. Wearing shoes, if you’re on carpet, isn’t a bad idea either. That includes working on a flat, non-conductive surface like a wooden or plastic desk. Bill Roberson/Digital Trendsīefore we start digging into the system to try to figure out what’s wrong, make sure that you are protected as best you can be from static buildup. But if when you hit the power button, fans spin up and lights turn on while nothing appears on the screen, it’s quite likely to be a hardware issue of some kind. If your system starts but doesn’t boot, search below for the relevant section. There’s noise or lights, but nothing appears on screen If in doubt, pull them out and plug them back in again. Make sure these are completely seated on their corresponding pin, which is either marked next to the pins on the motherboard, or in your motherboard’s documentation. The ends of the cables will say, for example, “HDD LED” or “PWR,” and some of them have positive and negative contacts. The pin location and layout will vary by case and motherboard, but it should look like a two-wide row of pins, usually encased in a plastic outer box. Make sure it runs to the motherboard and is well connected. Remove your case’s side panel and locate that cable. It’s different for every case, but most have a thin series of cables that run from your front panel (that includes the power button, indicator LEDs, and any front-panel I/O ports) and connects to a point usually found on the bottom-right of your motherboard. If you are getting power to your motherboard, the next thing to check is that your front-panel button is connected properly. If you do need to buy a new power supply, we’d recommend these. We’d suggest swapping out the power cable you’re using, and possibly trying a different wall socket before going down that road, though. If not, then you might need a new power supply. If you’re still getting absolutely nothing when you press the power button, look to see if your motherboard has any idle indicator lights to confirm that the motherboard is definitely receiving power. For more information on that, check out our comprehensive PC build guide. It’s also worth checking that your motherboard and CPU power cables are plugged in correctly. Is the power cable plugged into the wall and the other end into your power supply? Are the wall socket and PSU switched on? Double-check each end to make sure everything is connected properly. Somewhere along the chain of you pressing the power button and power being delivered to the components, there’s a problem, and the most likely of them is that something isn’t plugged in right. However, the fact that nothing happens is a clue in and of itself. This might be the most demoralizing of all PC fixing problems, because you don’t have much to go on when your PC won’t turn on. We’ve put together a list of the most common reasons your home-built PC won’t start and exactly how to solve them quickly and easily. ![]() Connected peripherals aren’t functioning or detected.There’s noise or lights, but nothing appears on screen.
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