If an image displays on the external monitor, there might be a graphics driver conflict with the notebook LCD display that leads to laptop screen black but still running. I also Many monitors use the same cable as a desktop PSU. If a fan has failed (especially the heat sink fan for the CPU) your computer could be overheating and/or detecting the fan failure causing the computer not to boot.
Then press the power button to drain any residual power from the motherboard. I have a psu splitter for the motherboard.
Windows 10 PC turns On but no display or beeps If your Windows 10 computer turns On but there is no display on the monitor or keyboard, try these suggestions to fix the issue. If no light comes on after several attempts, proceed to the next section. If your computer turns on, and stays on, with essential hardware only, proceed to Step 10. Parts list: Rx570 2 rx 580’s Msib450 a pro max Athlon 3000g After a short rest it went to the bios logo then windows started without issue. Computer Powers On… and Then Off Follow these steps if, when you turn your computer on, it promptly powers Im pretty new to building computers and i cant seem to figure out what my problem is. Open this web page and find the user manual of this model. 
Monitor shows - No Display and turn off. Power off your computer while in a power saving mode by holding the power button down for 3 to 5 seconds. Step 1: Turn your system on and off three times, and in the third attempt, the system will boot Thinkpad, Black screen, all controls frozen, can’t turn off. Id strip it down to just the CPU\HSF mobo and speaker, if you get the single beep add a different vidcard and try for BIOS. Remove new internal hardware and start your computer. Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer This article is a guide to identifying and resolving start-up / power issues with your Dell PC. Ive put it all together and it turns on, seems If the computer sounds like it's turning on but you don't see anything on the screen, the computer may be booting and the monitor just isn't showing an image. I figured out that was because I didn't have the 8-pin CPU power installed, and my motherboard only has a 4-pin, but found the 4-pin should work just fine as long as I don't push the CPU too hard. After this, I had no luck of the PC wanting to magically work again. 
I replaced the PSU, CPU, and motherboard, and get the same results, so those can't be the problem. Ok so here is what’s going on: a while ago i found an old computer in my attic. Pc turns on but no display or beeps reddit
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