Random Black Display (Is my power supply faulty)
Random Black Display (Is my power supply faulty)
Spontaneous black screen (Is my PSU faulty)? Key hardware details: PSU 1000W, CPU BeQuiet Intel Core i7, GPU 1080 Ti SLI, RAM 2x DDR4 Corsair VENGEANCE LPX 2666MHz (64GB total), SSD 500GB Samsung 970 EVO, secondary storage 1TB disc drive, motherboard Intel Z370. Monitor: Acer Predator XB373k with DisplayPort Monitor 2 – an older 60Hz Acer 24" monitor connected via HDMI Link to a fully assembled PC built by a Swedish manufacturer: https://www.inet.se/produkt/1513003/taur...080-ti-sli. OS: Windows 10 (64-bit). Power settings: none set. Overclocking: disabled. Description: My PC suddenly disconnects from both monitors at the same time, especially during gaming, but never when under heavy load. Sometimes it restarts on its own. During black screen mode, fans spin heavily most of the time, otherwise not. Even while running, the PC responds to input. Monitors fail to detect me. Reboots happen instantly before Windows, though this is rare. While rebooting, fans run at full speed for hours (tested 40 minutes). The problem started abruptly, without any hardware or software changes. Previously, everything worked normally. Windows logs ignore the issue, showing no errors. Only after a hard reboot did I notice. GPU and CPU temperatures remain low, and fan activity before the blackout is minimal. What actions have I taken? Reverted updates, reinstalled GPU drivers (clean), reset SLI, swapped primary GPU, updated BIOS, reinstalled Windows, changed power settings, reinstalled OS, adjusted power settings, refreshed power supplies and monitors, checked logs. My thoughts: I think the PSU might be faulty, but I’m not certain. Since USB devices work but HDMI/DisplayPort don’t, a GPU issue seems likely. Also, performance is normal when idle or non-gaming. If you have further questions, please let me know. Your help would be appreciated.
PSU problems are typically easy to identify. You lose all power and your system powers off immediately. This often occurs during high usage. I believe the fault isn’t the PSU but likely a graphics card. [However, CPU and RAM are also common culprits] Since this usually points to a driver issue, try removing one card at a time and see if the problem persists. If it does, swap it with another and test again.
I would attempt it without a GPU initially. Next, I would use one, then replace it with another.
I've used the system without any cards for roughly an hour while playing games. No problems have occurred so far. If there are no issues now, it might mean the issue won't arise. Otherwise, check your card slots or connections. Possible fixes include restarting the PC or updating drivers.
Are you placing both cards simultaneously? We advised against that—use only one. Run a test on one GPU for a few hours, then swap it out and run another test for a few more hours.