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- No output from gpu in hp prodesk 600 g1 sff

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06-15-2025 11:13 PM
Hi about a month ago, I got a GPU from a friend and connected it to my monitor using a cheap HDMI male to VGA female adapter. It worked fine for the first two weeks, but then I started running into a weird issue.
After shutting down the PC, I’d turn it on the next day and get no display at all. At first, I could fix it by restarting the monitor a few times, but the issue got worse over time. Eventually, I had to completely unplug both the PC and monitor for a while before it would show anything.
It worked perfectly on Friday, but when I tried to boot it up on Saturday nothing. Since then, I haven’t been able to get any display output from the GPU.
Right now, the only way I can get a display is through the integrated graphics (iGPU), and even then, only once I’m in Windows there’s no BIOS splash screen or anything before that from either the GPU or iGPU.
Windows detects the GPU as a Microsoft Basic Display Adapter, and I can’t install proper drivers. I’ve tried a few things, including reseating the card and checking power cables, but no luck. I've tried connecting it with both a passive hdmi to vga and active, but neither output anything. Both of these adapters work with my laptop though sometimes I have to reconnect it to work.
Any ideas on what could be going wrong? Could the adapter be the issue, or is the GPU failing?