Question Graphics card may have been damaged, still turns on but no display.

[NeoConstantine]

I had a GPU on my computer for a while, but I took it out for a bit, and now no display is getting through. But the card itself isn't dead. It still turns on LEDs and whatnot as soon as I turn on the power supply, not even the computer itself. It just has a problem with the output. How do I test it now? What could be the problem with the input, considering I've been using this card for a while?

 

[throwawayaccnt]

have you tried using compressed air for the PCIe slot and the connector pins? what GPU, how long was it out, where/how was it stored?

 

[NeoConstantine]

I don't remember the exact GPU brand, some Radeon or other. I put it in a computer parts case for a couple days. Why does it matter? I'm asking what could be wrong if it still gets power, how does that differ based on its storage?

Also other graphics cards do work with the computer, so I doubt it's a problem with the slot.