[SOLVED] ERROR 2100 on friend’s laptop

Solution
He said he hasn’t been messing around in the settings. He doesn’t have a computer he can use.

Unfortunately, that's the next step. Without a working PC, the drive can't be tested and without a working drive, the PC can't be tested. The other options are to simply buy another drive without knowing if this drive is the problem or take it to a PC shop and pay for them to diagnose the issue. Even if he buys a drive, if he doesn't already have a flash drive with Windows 10 install media, he'll need to get that, which also involves using another PC.
He said he hasn’t been messing around in the settings. He doesn’t have a computer he can use.

Unfortunately, that's the next step. Without a working PC, the drive can't be tested and without a working drive, the PC can't be tested. The other options are to simply buy another drive without knowing if this drive is the problem or take it to a PC shop and pay for them to diagnose the issue. Even if he buys a drive, if he doesn't already have a flash drive with Windows 10 install media, he'll need to get that, which also involves using another PC.
 
Solution