Boots and posts, no video; changed GPU, PSU, monitor

Acksentr

Honorable
Nov 16, 2013
1
0
10,510
I have a computer that was running for a few years unhindered but then one day decided to stop outputting video. I first tried a different monitor, removed the GPU (Asus Nvidia 210) and tried onboard, replaced the older 300w with 400w.
Same result - boots, lights, bells and whistles, single beep post, screen stays black and declares no signal.

Computer is Acer generic mobo with Athlon 2.2ghz, 4gb DDR2-800, 500gb SATA, and aforementioned Asus 210.

Bios does not display.