I received my grandfather's Commodore A1200 Amiga. I have fond memories from my childhood on this computer. But when I tried to turn it on, it just repeats an animation of inserting a floppy disk. I don't think it can read the hard drive. What can I do?
I don't know how to troubleshoot these types of computers.
On the Amiga A1200 a hard drive was an optional add-on (We're talking an era before most computers had hard drives at all). It may be that your Amiga does not have one installed.
If this is the case, then you will need to load any software from floppy disk (hence the insert disk animation).
If you wish to determine if there is a hard drive, you can remove the screws from the underside of the case (around 8 screws from memory), and lift off the top half of the case. The hard-drive (if present) will be located in a caddy towards the top left corner of the case, partly underneath the keyboard (if memory serves).
The hard drive type will most likely be* a 2.5" (standard laptop size) PATA drive, which is powered from the motherboard via the 44-pin ribbon connector cable (40-pins standard PATA + 4 pins +5V/Gnd).
(* There are hacks to connect a 3.5" drive internally, but they are a bit messy imho, and a standard 2.5" drive is far more likely)
Let us know if there is/isn't a hard drive present, and we'll do our best to help you fire up your Grandfather's treasured system from there.
All the best, welcome to Amiga.org, and sorry to hear (for whatever reason) that your Grandfather has had to pass on his system.
Rich
