Monitor, keyboard or mouse will not work. ... and SATA connectors which plug into peripherals like the hard drive and optical drive (SATA connectors have a long, narrow L-shape). Computer won’t turn on. Try disconnecting all your peripherals to see if that’s the core problem. My computer itself turns on - fans, lights, etc. With the PC turned OFF turn the monitor OFF, then after 5 seconds switch on again. are all going - but none of my peripherals are receiving power. it was working perfectly fine before I left for the weekend. I'll start with the bad news: There's a … i built it yesterday, but when i turn it on, the fans and lights all come on but no display or usb usage is there. i tried cleaning the … ... and anything supported by USM doesn't turn on. The monitor should be showing "No signal" if the computer itself is not working. Computer turns on but no signal or usb ports working ... it but with the vga cable connected it just still says no signal and the lights on the mouse or keyboard dont seem to work. 2) Disconnect all peripherals (your … Try someone else's on your computer or yours on theirs. You should see “No Input” even if its not connected and the PC is off. Sometimes, certain peripherals connected to your computer may also cause the black screen issue. Newer peripherals like new Wi-Fi printers can now operate without being directly connected to a computer. Note. To find the roles or functions of each of the peripherals, click on each of the above links. [Troubleshooting] PC start up, fans work, no display or usb Hello, I have been trying to built a little pc out of components that i have removed from my gaming PC. It will disappear after a fews seconds. PC turns on, but no peripherals work Please help, the processor is a AND FX3600, and running win8.1 and won't turn off UPDATE: THE beeper beeps for three seconds and then repeats I myself am not a computer hard ware type but it seems that I will start to learn as I slowly fix this computer. The Dell peripherals don't work on my Lenovo--W7--computer, but the other ones work fine on that computer. Here is how to do it: 1) Press and hold the power button until your computer turns off. Report. Otherwise it could be the motherboard itself has failed, the CPU, or the display card. ... tell whether the POST failure is being caused by a faulty PSU or a bad RAM module if you only have the one machine to work with. My mouse/keyboard/mic lights don't turn on, and my monitor is receiving no signal (even though it is receiving power because it's plugged into its own outlet). Unlike the computer, a peripheral is incapable of operating by itself and relies on the computer to function properly. 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