PC – No signal boot

I tried booting up my PC, but it shows no signal on the monitor. I’m not sure why it shows it. I’m not sure what it is. Everything seems plugged in, but I’m not sure why it isn’t working.

Things I have already tried:

  • Reseated the RAM
  • Reseated the GeForce GTX 970.
  • Checked all cables were plugged in.
  • Tried a different HDMI cable, also using a different monitor and plugging it into the motherboard HDMI.

Specs:
Intel Core i7-3770 @ 3.40GHz (Water cooled for icy cold temperatures 🥶)
NVIDIA GeForce GTX 970 4GB (Gigabyte)
14GB DDR3 RAM
240GB Crucial SSD (fast boot drive)
1TB Western Digital Hard Drive
ASUS P8H77-M Motherboard
Windows 11 Home 64-bit Installed