Install Graphics Card - 3 long beeps, 3 short beeps

[Abacus001]

I have a HP Envy Desktop 750-424, Windows 10 64bit, 300W PSU, and an Intel HD Graphics 530 Integrated Video.  I have already updated to the latest BIOS available.  I tried to install a video card.  

Video Card:  PNY Nvidia GeForce GT 630      One site that I went to said this requires 300w, another said 350W

When I installed the card, the computer sounded 3 long beeps followed by 3 short beeps.  The screen remained blank.   Does this sound pattern indicate that the video card that I installed requires more power than my PSU can provide?  Or does it mean something else?

One of my installation attempts was:   before installing the video card, I went to Device Manager, Uninstall device (display adapters) to until the 530.   I did not check "Delete the driver software for this device".  Beeps still occurred.

[Paul_Tikkanen]

The GT 630 should be able to run fine with a 250W power supply.

The 3.3 beep code error means that there is a problem with the graphics card.

HP Desktop PCs - Computer beeps or a light blinks during startup | HP® Support

If you know that the Nvidia GeForce GT 630 is in working condition, I speculate that the problem is that the card is too old for your PC's BIOS. and the secure boot setting is preventing it from working.

If you want to continue to use the card, see if disabling the secure boot setting in the BIOS gets it to work.

Otherwise, you need to install a more modern graphics card.

One in the performance range (or better) than the GT 630 would be the GT 1030 GDDR5 card.

[Abacus001]

Thank you for your response.  I considered disabling the secure boot setting in the BIOS, but I was afraid of the warning messages.  Is it ok to do this with Windows10?  Is it easily reversible?  Photos of my BIOS menu and warning provided.

[Paul_Tikkanen]

You're very welcome.

Disabling Secure Boot should be fine as long as there is a separate Legacy boot option in the BIOS that remains disabled.

With secure boot enabled we know that the drive is formatted with the GPT partition table, and the PC can only boot in UEFI mode.

Legacy mode uses the MBR partition table, and a GPT-formatted drive cannot boot in legacy mode.

On some notebook PC's when you disable secure boot, it automatically enables legacy mode.

Usually, most desktop PC's have an enable/disable secure boot option and an enable/disable legacy boot option.