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First I suggest checking whether you run a
power cable from the Power supply to your video card, it helps also to boot PC with side panel open to
check whether video card fan is sniping, and obviously have the
monitor cable hooked to the new card output.
1- Attach your monitor video cable to your motherboard rear I/O video output (instead of your new video card), so you can get a display when you boot your PC,
if successful >> step 2
2- Here is a detailed guide (but needs some navigation effort thorough it's + signs)
on how to enter Bios and the menu you would expect >>
https://support.hp.com/us-en/document/bph07110#bph07110_ad Basically in order to enter Bios when computer boots up
hit F10 repetitively, once there navigate to 2nd menu
tab = Advanced using right directional arrow on your keyboard, then scroll down with down arrow to the entry "
primary video display" and verify it's on
PCI, if not you can toggle through choices for that entry by using "-" minus sign or "+" sign, and note choices available, until you get to PCI,
hit enter, then
hit F10 to save and exit, your computer will reboot, r
e- attach your monitor video able back onto the new video card output, if no output reset-button your PC.