|"My computer broke the sound I think i broke by motherboard according to person"|
Fixing the sound should be very easy. If it's a driver issue, all you need to do is reinstall. If it's a hardware problem & the system runs well other than the sound issue, all you'd need to do is install a sound card which you can get for as little as $10-15. Please explain the sound problem in more detail & include your system specs.
Other than that, I suggest you avoid CyberpowerPC systems.