I have noted a difference when I use the internal or external disk.

Internal connection:

If I start the Mac first the diskette with blinking questionmark appears on the screen. When I put in the diskette the questionmark is still there but not blinking. Disk constantly spinning. If I put in the diskette first in the diskdrive and then put on the Mac: Happy Mac appear on the display but nothing more happens, no booting. Disk constantly spinning.

External connection:

If I start the Mac first the diskette with blinking questionmark appears on the screen. When I put in the diskette the questionmark is still there but not blinking. Disk constantly spinning. If I put in the diskette first in the diskdrive and then put on the Mac: questionmark is still there but not blinking. Disk constantly spinning.

I dont know if that difference mean anything. The mousepointer is working. Can it just be bad connection from the diskdrive?