When a computer turns on but no display on monitor appears, although the led light is on and fan spinning can be observed, this means the computer may have failed the POST(Power On Self Test). If this happens before a successful POST, one or more of the following will be at fault; Power Supply Unit, Motherboard, Processor, Ram, Graphics Card Unit.

CASE: IONX KZ16
PSU: Corsair TX750M
CPU: Ryzen 9 3900x
MOBO: Asus B450m-k
RAM: 16 GB (2 x 8GB RAM)
GPU: Palit GTX1080
DRIVE: Sabrent 512GB SSD

In this troubleshoot a pc video, HealMyTech teaches you how to eliminate each component one at a time and fix your NO POST issue.

However is this happens after a successful POST, i.e no display on monitor, then the issue could be one or more of the following: Video cable, video post, monitor. Watch this troubleshoot video for more details:

Computer Turning On But No Display - Pt 8 Troubleshoot A Monitor    • Computer Turning On But No Display - ...  

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