During install you created a boot flop ? if so try
booting from that.
At least this must be a booting issue, check also
your bios settings maybe (if you installed it by booting
the install cdrom) its, for some odd reason, still checking
for a bootable medium there. But then again there should
be an error on you screen.
I think your lilo or mbr is somehow corrupted
If you aint got a bootflop you have the use the install
cd again, for it has a rescue option during the first boot stage.
Don't know exactly the use of rescue will try some things out for ya
if you still need that