Issues Exiting Sleep Mode and Odd Behavior On Restart with GPU

Question

I'm running a completely stock HP P7-1240 desktop except for an EVGA GeForce GTX 750 TI SC GPU. The GPU runs fine when the computer is up and running (which is odd because the forums have several other threads mentioning that the 700 series should be incompatible with my BIOS).
However, there are two main strange problems that have arisen since installing the GPU. One is that, whenever the computer enters sleep mode, it refuses to wake back up properly. It seems to me that the computer activates but does not send any signals out from the back panel (at the very least, no video signal because my monitors stay blank). On a rare occasion, it will wake back up properly, but at least 90% of the time, it needs to be restarted. Upon restart, sometimes the same issue occurs (no video output), and the computer needs to be restarted a second time before it will boot up again.
This leads to the second problem. When starting, the computer goes to a black screen listing basic computer specs (see attached photo. At this screen, the computer does not respond to any input.  It proceeds to beep 3 times, all the same length and pitch spaced about 30 seconds apart. After the third beep, the screen goes black and then the computer boots up normally with no further odd behavior.
Without the GPU, none of these issues happen. At the very least, not regularly.
I have seen another thread mentioning that, although the HP support page for my desktop does not list it, there is a BIOS update for my motherboard that has fixed issues relating to more modern GPU's. By nature of it being a BIOS update that does not (appear to) officially support Windows 7, I'm hesitant to move forward with that potential solution.
Although I'm planning to build myself a new computer from scratch at some point, I was hoping to at least get another year out of this machine, if not 2.  While this issue doesn't appear to be immediately threatening the stability of the computer, I can't help but think that this is an issue I should iron soon to avoid future issues (not to mention it would save me a fair amount of electricity to be able to enter sleep mode on a regular basis).
Any suggestions would be greatly appreciated!
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Answer 1

Hello @johnmwalker,
I understand that you are having some issues with your HP Pavilion p7-1240 Desktop PC waking up from sleep mode. I am not sure how much can be done for the delay on your startup with an OEM BIOS you are limited in what you can do and since your graphic card works I think you would be better off not messing too much with the BIOS at this point. The one thing I would try is going into the BIOS using the HP Support document:BIOS Setup Utility Information and Menu Options, and under Advanced > Power-On Options set POST Messages to Disable and POST Delay (in seconds) to None.
Now the waking from sleep mode issue  could just be the hybrid sleep setting causing you an issue with sleep mode. Use the following steps to disable hybrid sleep:
Step 1. Click Start
Step 2. Click Control Panel.
Step 3. Click System and Security
Step 4. Click Power Options
Step 5. Click High Performance from Power Options
Step 6. Click Change plan settings
Step 7. Select Change advanced power settings
Step 8. Click the plus (+) sign next to Sleep
Step 9. Click the plus (+) sign next to Allow hybrid sleep
Step 10. Select Off from the drop-down menu
Step 11. Click OK
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