https://www.google.com/search?q=notepad shows that the word “notepad” is commonly used for either the paper version or a program. None of the 2 seems to apply here.
Can you tell something more about your device?
Does the user manual tell anything about what that continuous beep means?
Anyway, this generally means that something is very wrong with the hardware. Wrong enough to call alarm.
It might be possible to have it repaired, but it might be possible also that the repair shop advises that it’s too expensive to do that. It all depends on the cause.