Computer is beeping when booted

Hi there. Gonna make this as simple as possible here. Last night I was using my computer like I usually do, shut it off and went to bed. I wake up this morning, turn it on, but it's beeping with 1 set of 5 beeps. So far I tried reseating the RAM and it didn't resolve the issue. I am confused as to why it'd be working one night and not work the next morning. Can someone help me, please? Thank you.

Mobo: ASRock Z75 Pro3
CPU: i5 2500k
GPU: MSI 560Ti Twin Frozr II
RAM: G. Skill 8GB
PSU: Antec 650W
Cooler: Noctua NH-D14
HDD: Hitachi 320GB
Case: Enermax Ostrog GT

Google is showing 5 beeps with that board to be indicative of a GPU issue.

Try reseating the graphics card and booting up. If it does the same, remove the card, and connect the monitor to the video out from the motherboard (which will use the iGPU of your CPU). See if it will boot like that.