You wouldn't have any video if the GPU was physically missing... unless the CPU is able.
If there are two separate chips controlling video it's possible that whoever worked on the computer disabled it in BIOS.
I believe this a driver problem something I had with my rx560x, for me it show radeon pro 460 or something like that.
So what I did was, I did a clean uninstall of all my drivers using a third party software called DDU (display driver
uninstaller). Then did a clean install of my drivers through acer's page for my laptop. In your case the toshiba
page for your laptop.