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These sources imply that it needs to boot from floppy, whether it has a HDD or not, and you need to run a program called NVR to access BIOS settings- i.e. unlike later PCs, you can't hold down a key at power-up to get into BIOS and check which devices are attached:
https://oldcomputer.info/pc/ams1512/index.htm
http://www.retroisle.com/amstrad/pcs/Technical/Firmware/ROM_BIOS.php -
I have some old DOS 5 1/4"s somewhere, if you want to try them.
chez_jay
Oliver Schick
@nickvonfiction
Thanks for the insights on the Amstrad. It's a bit before my computing experience! If it has to boot from floppy then I guess it is a duff system disk that's the problem. 'll have to have a look inside to see if there is an HD but from looking at the link, seems not as standard...