This happened when trying to check a Seagate hard disk on an Acer TravelMate 5512 with SeaTools for DOS v2.20. Symptoms:
- The SeaTools bootable CD booted ok, and the initial SeaTools interface showed up with a licence acceptance screen.
- Mouse was shown as installed as “PS/2” during the FreeDOS boot.
- No mouse or keyboard input works. This also applies when booting up with a USB mouse connected.
- Ctrl+Alt+Del brings one back to the DOS level, and here the keyboard works.
Workaround: this problem appears only on some systems, not on all. So I simply switched the hard disk into a different computer (ThinkPad T60), and here mouse and keyboard work.