3) Remove your graphics card from your motherboard and then insert it firmly in its slot. In case the video cable for the monitor is detachable, try using a different video cable to test in case the cable is faulty. Unplugging and plugging didn't work. My lap top and iPhone work fine. Then it just goes to sleep. See if this issue persists. When you disconnect the cable, instead of an on-screen message, the light turns amber, indicating that the monitor lost signal and is working properly, but is out of range, or not receiving the signal. Page 1 of 2 - My Screen shows "No Signal" but my PC Starts up. After power outage PC turns on, but there is 'no signal' on the monitor. PC turns on, No signal, keyboard/mouse. After a power blackout, I powered up my PC. Verify the monitor cable is connected correctly and securely on the back of the monitor and the back of the computer. Replace the HDMI, VGA or DVI cable if you have on in spare and check again. It turned on but there was 'no signal' on the monitor. When the PC restarted it came on perfectly fine but I am getting no signal on my monitor and my razer keyboard & mouse aren't coming on or lighting up. 4) Plug the power cable of your monitor back in and connect it to your PC.. 5) Hold the power button down for 30 seconds to a minute and then connect your power cord back and turn it on. Computer not transmitting a signal. So i checked all the wires to make sure they were all pluged in and that there where no bent pins. Assuming that your problem is also "Monitor no signal after start up" as per the thread. Hi one day i sat down and tried to turn my desktop on and the monitor said "no signal input". - posted in Internal Hardware: Hey! So Ive researched for the past few days and figured all my mistakes (using HDMI). If you still get the no signal message on your screen, don’t worry! If the computer is turned off, it cannot transmit a signal and causes the "no input signal" message. I have tried all 3 connectors, but my monitor is not receiving any signal no matter what video port I connect to. I … My motherboard is a P8Z77-V LX The motherboard has 3 connections for a video signal, 1x VGA and 2x DisplayPort. The computer is never been damaged or nothing its a great pc and had it for a few years till now its says no signal. Question Computer turns on but no signal on monitor: Systems: 1: Jun 5, 2020: R: Question PC turns on and off in a loop , no signal on monitor: Systems: 4: May 22, 2020: S: Question New system powers up, no signal to monitor, then turns off after less than a minute? Some monitors do not have on-screen messages but instead use the lights to indicate no signal. Monitor not connected properly. All was well, but when I tried to turn it on today, there was no signal to the monitor. Make sure the computer has power. i turn my pc on and you can see its on because i can hear and see the CPU fan and the other fan spinning but i get on my monitor no signal, i have tried taking out ram cleaning it and then put in still don't work. Okay. More often than not, with this issue “computer turns on but no signal to monitor”, cable is the culprit. I recently bought a ThinkCenter M93p SFF computer. You didn't say if you tried your monitor on a different known working PC to check if it worked OK, a different known working monitor or a new monitor cable or even a different video output signal type (if available) e.g.