Need a HDMI out so need to upgrade the GPU but when I fit a GPU board (pcie x 16) I get 6 long bleeps and no graphics have tried 2 boards (at least one is known to be good) both give the same results ,advice please.
I think you need to disable Secure boot (Link to HP document) and enable Legacy support to use a different graphics card.
Look at "What if the PC does not boot properly after installing new hardware".
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