that either means that the screen is damaged or theres a more serious board issue. have you tried disassembling the watch and reseating the screen connector?
does the computer boot after it makes the beep sound? older computers and laptops would make a beep sound when turning them on and there's usually a bios setting to turn it off.
that usually means that there is an issue with your hard drive or there's something wrong in windows. when pressing any key does anything show up in the boot manager?