1| When posting a thread of troubleshooting nature, it's customary to include your full system's specs. List them like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
2| What was your previous GPU? I'm assuming you were on an iGPU or an entry level discrete card.
3| If you can barely get to BIOS or remain there, it's an indication that your PSU is not up to the task.
4| Are you on the latest BIOS for your motherboard?