3 long/3 short beeps at boot after connecting new monitor - only happens with DP, not with HDMI

[palacekeeper]

Thanks Promethee, the firmware update fixed it! 

Graphics Firmware Update for DisplayPort 1.3 and 1.4 Displays | NVIDIA (custhelp.com)

One thing to note: I did have to enter my Bitlocker recovery key in order to for the machine to boot after updating the video card firmware. So, for anyone else that might run into this - if you are using Bitlocker, be sure to have the bitlocker recovery key handy for the first boot after applying the firmware update. You can probably alternatively just temporarily disable Bitlocker, but I would recommend that you have the recovery key, just in case. 

This firmware update completely fixed the issue. I can now access the BIOS/UEFI modes and there is no beeping. Thanks!

[Prométhée]

 

congratulations you have dared!!
You can specify for the Bitlocker recovery key!
I've never looked about this, and I can't help on this subject I think!
so if you could explain a bit how it works
I'm saving this topic as a bookmark, it might help someone else.

very happy for you that it worked well..

[palacekeeper]

Sure, to further clarify regarding Bitlocker:

Bitlocker offers drive encryption native to Windows, and stores encryption information in the TPM chip. It helps to prevent your data from being stolen, even if the drive is stolen. In that scenario, it will be encrypted and useless to the thief.

At boot time, Bitlocker takes a "snapshot" of what the boot enviroment looks like. If that ever changes, it will request a recovery key. The recovery key is generated when you enable bitlocker, and you can store it in multiple ways. Active Directory also provides options to store the key automatically for users. For home use, you can store it on a USB drive, save as a file, or print it out. 

In this scenario, bitlocker detected that the boot environment changed, so as a precaution, it prompted for the key. Had I not had the key, I would not be able to boot up any further. So, it's very secure and you MUST keep the key stored somewhere, just in case ever needed.

Note that in this scenario, you only need to enter the recovery key one time. After that, bitlocker takes a new snapshot of the boot environment and uses that from that point on. Thus, you do not need to enter the recovery key again.

Other examples of times when you might need the recovery key are if you were to install new hardware, memory, drives, etc. to where the startup environment is different. Very secure, and many businesses use it to protect both workstations and servers.

Hope this helps!