Long single beeps from UPS. Is it possible my new pc is
Yes, you are overloading the UPS. It can only support 390W and your GPU alone is rated at up to 300W peak. By the time you add CPU, drives, monitor, the extra 15-20% from PSU conversion loss, etc you''ll be blowing well past that 390W limit. I build this system yesterday, and when playing a game, every 2-10 minutes I would get a 2-3 second long