I have 2 different GPUs right now (calibration reasons) and could sometimes get around the issue by switching video outputs to the other card. Its almost like powering off the monitor causes the GPU to stop providing output all together and it won’t trigger back on. Well, it turns out the screen saver continues to run - sending video output to the monitor - even when its off! Now, whenever I turn on my screen, the saver is faithfully running and I’ve had no issues since. The other day I applied a screen saver out of nowhere, thought my kids would like watching it. The only way to get the screen back was to reboot. It usually happened after a windows update. I had this issue with a Samsung SD850 32”, would be fine for a long time then start up again with the no-signal screen after turning monitor on (after previously turning it off while the system was still on). Check to see if there is any visible defects and check all the slots to see if they're damaged. It is also quite common as motherboards are quite complicated to manufacture. Broken Motherboard: This one is quite hard to discover although if everything seems to be not running except the PCU fan than this might be true.If so then also check if the CPU is cracked by removing it, holding by the sides, and also check if any pins are damaged on the CPU. Broken CPU: This one sucks to check although check if the CPU cooler is properly installed by removing it and checking if the CPU coolers thermal paste has spread on the CPU well.If none of the components (including fans, LEDs) is turning on then its probably a signal of a broken PCU. Broken PSU: This one will be pretty obvious.Some knock-off PCU’s actually can only supply down to half as what the specified to be able to do. Insufficient PCU: If you have bought a PCU with bad reviews or a PCU that cant handle the amount of wattage your parts need than this could be a problem.Otherwise, try to test another working GPU in your PC. Just plug the monitor/video cable into your motherboard and see if you get an output. Broken GPU: If your CPU has onboard graphics than it will be easy figuring out if your GPU is broken.The PC will split its data evenly between each stick this means if any single one of the RAM sticks are broken than the PC will not function. Broken RAM: Check if the PC works with each individual RAM stick in the first, second, third and fourth RAM slots.If none of the steps up to here has worked than their might be a broken part:.Clean any dust out of the PC as this may cause shorts and also stop the PC from cooling properly.Some motherboards require RAM sticks to be in certain slots first before others. Check if the PC’s RAM and GPU are fully inserted into their slots and in the rights slots.Try avoiding touching any tiny parts on the components as well. If these steps didn’t work than sadly it’s time to start looking inside our PC… Make sure to unplug the PC anytime your touching anything inside the PC. Check if you have a broken monitor by checking the monitor status light and trying with a different monitor.Check video cable is broken by testing with another cable or looking for visible defects.
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