Does it all the time after a few minutes. If your monitor still goes black randomly, your issue is very likely caused by a hardware failure. In this configuration the external monitor blacks out for a couple of seconds randomly a couple of times per hour. I have a similar problem using an external LG monitor, flashes to black for a few seconds then comes back on. Monitor goes black randomly - posted in External Hardware: So I have an acer x223w monitor. I left for lunch and came back to a black screen. I have a brand new 2017 Spectre 15" laptop hooked up to an external monitor with an HDMI cable. In this case, you’ll need to bring your monitor or your computer to a repair store and seek professional help. Windows 10 Monitor Keeps Going Black Then Comes Back. I bought an Acer Nitro VG240YP monitor a couple days ago and the display goes black for a second and turns back on. Recently, lots of computer users complain that their PC or laptop screen goes black every few seconds: case 1. It happens when I'm gaming, watching youtube videos and even when I'm just reading something on the PC. "Sometimes this doesn't happen but when it does, my screen would go black for a second then 5 seconds go by and it happens again (it would repeat another 10 or more times). External Monitor is detected, but black My monitor was working perfectly this morning. Comment brikeh macrumors 6502a. Showing on screen [Displayport] indicating it doesn’t get signal. It goes black for about 2 seconds, and at seemingly random times, it flicker back and fort. Check if this fixed your problem. Looked at other posts about this issue be could not find anything addressing my issue. Secondary monitor is working. The monitor is detected, as I can drag windows over to it. Monitor randomly goes black for one second at a time I have a relatively new monitor and computer system (bought May 2003) and in the past few months, the monitor will go completely black for about one second and then come back on randomly throughout the day. I'm hoping that Apple writes a driver to fix this since it's pretty annoying to be writing then everything goes black. Over the past few months, my primary monitor randomly (no pattern to the issue) goes black but the led shows it to still be working. As soon as I stop being active on the computer, my monitor blinks black and then the screen reappears. Got a monitor issue. I've noticed that my external LCD randomly went black a couple of times. Only way to get the primary back is to reboot the computer. I've tried installing updates and the hdmi cord, but nothing has fixed this. 1) Press the menu button on your monitor and select Menu. Ive had it for about 3 years but about a year ago it blacked out on me out of nowhere. 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