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Help! Screen turns black but computer still runs!

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A followup to this issue would be much appreciated, having the exact same problem with completely different hardware. Screen goes black, computer stays on but doesn't respond at all, even caps lock key does not toggle led on keyboard.

I am convinced it is the PSU at this point but would love to know how this one played out before I go down that road.
 

de.das.dude

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Stuck in a PC. halp.
System Name Monke | Work Thinkpad| Old Monke
Processor Ryzen 5600X | Ryzen 5500U | FX8320
Motherboard ASRock B550 Extreme4 | ? | Asrock 990FX Extreme 4
Cooling 240mm Rad | Not needed | hyper 212 EVO
Memory 2x16GB DDR4 3600 Corsair RGB | 16 GB DDR4 3600 | 16GB DDR3 1600
Video Card(s) Sapphire Pulse RX6700XT 12GB | Vega 8 | Sapphire Pulse RX580 8GB
Storage Samsung 980 nvme (Primary) | some samsung SSD
Display(s) Dell 2723DS | Some 14" 1080p 98%sRGB IPS | Dell 2240L
Case Ant Esports Tempered case | Thinkpad | Antec
Audio Device(s) Logitech Z333 | Jabra corpo stuff
Power Supply Corsair RM750e | not needed | Corsair GS 600
Mouse Logitech G400 | nipple
Keyboard Logitech G213 | stock kb is awesome | Logitech K230
VR HMD ;_;
Software Windows 10 Professional x3
Benchmark Scores There are no marks on my bench
if your caps lock key doesnt work, it means that your system has crashed or "hanged"
 
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System Name 0x895
Processor Intel i7 4770k
Motherboard Gigabyte UD4-H
Cooling Corsair H80 with Link commander
Memory Corsair Dominator GT DDR3 2000Mhz
Video Card(s) MSI HD6970
Storage Samsung 840 Pro 256Gb, 2x Samsung F3 in RAID 0
Display(s) NEC Multisync FE2111 sb
Case 0x895
Audio Device(s) Asus Xonar D2
Power Supply Corsair AX760i
Seen this a good few times myself, load linux on a live cd and do whatever you where doing in windows see if the problem occurs, I suspect a system crash which is why your having to reset.
Check the logs in windoze event viewer (booting windows 8 of course) and see if you have a crash along the lines of "Catalyst driver stopped working" when this has happened to me I have a completely static desktop no mouse movement or squat so it seems the same is happening to you only the the monitor in your case is going to Standby because it has no refresh signal from the PC (I use a CRT which doesn't need a refresh signal).
 
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