I recently picked up a free HP ProBook 4540s from Facebook Marketplace. It was advertised as non-working — when plugged in, the caps lock light blinked and the fans spun at full speed, but no display, no POST.
First suspect? Bad RAM? I swapped sticks and slots — nothing.
Digging deeper, I found an obscure forum post suggesting BIOS corruption is somewhat common in this model laptop. That led me to discovering a BIOS dump on another site (after plenty of hunting). I used a CH341A programmer and SOIC8 clip to flash the BIOS chip directly. No luck with flashrom (kept hanging), so I busted out my trusty Windows XP VM and the Chinese flashing software.
After writing the dump and reconnecting the charger… it posted!
Moral of the story: don’t give up on “dead” laptops — sometimes a $5 programmer and a bit of digging can bring them back to life.
