PINE64

Hi I just recieved mine it worked at first but was slow and glitchy and it froze since then it just says Pine64 logo then black screen.

Any help is appreciated

I'd guess you're running low on battery. I needed a 3A USB-Loader to get mine charging.

turn it off, remove the sticker that protects the battery, give a nice charge using charger (not in the computer, it won't charge) and try again.
If fails try to reinstall UT
check https://forum.pine64.org/showthread.php?tid=10130