I built the computer below a few months ago and it has been working fine (except for a screen freeze every now and then). A few days ago the screen suddenly went black. I cannot see anything, including boot-up screen or BIOS. I have tried a different monitor, HD, cables, I have tried to boot from the CD/DVD and nothing happens. All the fans are running and HD is spinning, just can't get a signal to the monitor.
PCPartPicker part list: https://pcpartpicker.com/list/7pf34q
CPU: AMD - Ryzen 3 2200G 3.5 GHz Quad-Core Processor ($94.99 @ Newegg)
Motherboard: ASRock - AB350M Pro4 Micro ATX AM4 Motherboard
Memory: *GeIL - EVO SPEAR 8 GB (2 x 4 GB) DDR4-2400 Memory ($47.98 @ Newegg)
Storage: Western Digital - Caviar Blue 1 TB 3.5" 7200RPM Internal Hard Drive ($48.08 @ Newegg)
Case: Thermaltake - Versa H15 MicroATX Mid Tower Case ($39.24 @ Newegg)
Power Supply: *SeaSonic - FOCUS Gold 450 W 80+ Gold Certified Semi-Modular ATX Power Supply ($68.75 @ Newegg)
Optical Drive: *LG - GH24NSC0B DVD/CD Writer ($18.98 @ Newegg)
leeu, your power supply seems a little weak, but I doubt that is your problem. Can you borrow a video card to try? Are you running the latest BIOS version for your MB? Please follow the instructions in your manual and do a Clear CMOS and see if that helps. Please get a speaker for you MB, so you can hear the beep codes at boot and post them.
Thanks and enjoy, John.