What might have happened (as I found during many hours of trying various resolutions out - see other thread on here

) that the screen only holds so many timings settings and that it may well have lost those for the 80x25 text screen used during bootup.
Try hitting the < key on the front of the Lilliput screen as soon as the boot screen appears as this will autofocus the lilliput (and I might add this seems to be one of the best monitors I have had for getting the image edge to edge and centred on its own) It might even be better if you hold down del key to keep it on this resolution as the bios setup uses the same screen.
HTH