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If the Tascam DR-100MKIII will not stay powered on after charging for hours then the batteries may need replacing,
Let me know what type of computer you are using (e.g. Windows 10 laptop, Apple iMac, etc) so i can assist you further with the computer not recognising the Tascam.
The Tascam uses a built-in rechargeable lithium-ion battery which you can charge using either USB or an AC adapter. The orange charge light should come on when it is charging and go out when charging is complete.
You can also try fitting standard (non-rechargeable) AA batteries to it.
Here is the full user guide: https://www.tascam.eu/en/docs/DR-100MKIII_RM.pdf
If connecting to a laptop, ensure you have the power cord connected to it, otherwise there may not be enough power getting to the USB port to detect the Tascam.
If it still won't work, try connecting to a different USB port or try connecting to a different computer, ideally a desktop.