I have this PC that has failed. Upon powering on, nothing shows on the screen, no video data sent, monitor stays in off mode. The keyboard lights do not blink. Only the DVD light blinks at the start, but there doesn't seem to be HDD activity. This is an old BIOS machine, not UEFI.
I have already tried different monitors, leaving it unplugged, removing the motherboard battery for a time. There is no change, so it's definitely a failure of something on the motherboard. The question is how likely is it to be a corrupt BIOS? Do these symptoms match, or is it the motherboard broken in some other way? The difference is in attempting to replace the BIOS chip for about $20 vs the motherboard for $120.
There were boot up failures that led up to this total failure. The BIOS splash/POST would appear, but then the OS would fail to boot. If it's related, I would think it was signs of a motherboard failure, not a BIOS corruption. Correct me if I'm wrong.
Also, the GPU is integrated. There is a PCIe slot but I assume the BIOS settings need to be changed to use it, so there is no way around it.
Videos
BIOS failures are very uncommon, when they do happen it's usually the result of a failed attempt to update. Because the BIOS memory is on an EPROM it's difficult to have it fail under normal circumstances but with a 7 year old computer you're overdue for your first part failure. The chip may simply have worn out at this older age.
Hope this helps explain.
MY BIOS apparently was corrupted somehow because my laptop was bricked and nothing worked until I shorted the CMOS battery which reset the BIOS. Problem solved.