Cards that power up but never give a usable display
A GPU can light up, spin its fans, and still fail to do anything useful. Sometimes there is no display at all. Sometimes the card posts once and then refuses after a reboot, or only one output works, or the system goes black the moment drivers load. Those symptoms can point to very different problems, which is why a no-display graphics card is one of the easiest repairs to misread from the outside.



