Just did a test boot, there was display on the monitor, but no post beep.

[Hellomoonkay]

My first build, on the screen it says
ASROCK UEFI SETUP UTILITY

UEFI Version: z68 Extreme3 Gen3 P2.10
Processor Type: Intel(R) Core i5-2500k cpu 3.30GHz
Processor speed: 3300MHz
Microcode update: 206A7/25
Cache size: 6144kb
Total Memory: 819mb with 256mb shared memory and 2mb gtt memory
dual channel memory mode
DDR3_a1: none
DDr3_a2: 4096MB DDR3-1600
DDR3_b1: none
ddr3_b2: 4096mb DDR3-1600

I'm assuming I did something wrong, but IDK how to find out what.

Edit:

I've been watching newegg's guide to building, and he had an hdmi cable connected to the video card, but I didnt, does that have anything to do with it?

[chaud]

If it boots fine don't worry about a beep.

[Hellomoonkay]

When I did it that time, the display was connected to the onboard video, so I tried it again with it connected to the video card, and it didn't display anything, and I noticed I didnt have the psu connected to the video card, so I plugged it in, but I forgot that the psu was on when I did that, and it still wont show anything through the card. Did that probably mess up the video card?

[chaud]

Connect to the onboard and see if you can switch display outputs in the BIOS. Worst cast you need to reset the BIOS.

[BobAwesome]

Did you plug in the little 4 pin speaker? That's what makes the beep.

[Scratches]

In-case speakers are, these days, a relic of the past -- very rarely will you find a new DIY case that has one (Dells and such may still ship with them, idk) -- so, it's kind of normal that you didn't hear the beep on a successful POST.

As long as you have a video signal and everything reads fine (e.g., no errors, but it'll halt on errors anyway), you're...well, fine.

[Libram]

Did you plug in the little 4 pin speaker? That's what makes the beep.

I'll ask the same. Most motherboards come with a tiny speaker for motherboard sounds (this is not a case speaker, it is only for beep codes from the board.)