Having the same problem sometimes.
I logon in commandline - runs startx and shutdown.
Afterwards I can normally boot into kdm (kubuntu 7.10 - fully upgraded) - but sometimes the problem comes back.
Have tried many of the above things without permanent succes.
I do NOT have a SATA-disk ! - but still it might have something to do with the hardware.
ASUS K8U-X with AMD Turion S754 1.6 Ghz.
Having the same problem sometimes.
I logon in commandline - runs startx and shutdown.
Afterwards I can normally boot into kdm (kubuntu 7.10 - fully upgraded) - but sometimes the problem comes back.
Have tried many of the above things without permanent succes.
I do NOT have a SATA-disk ! - but still it might have something to do with the hardware.
ASUS K8U-X with AMD Turion S754 1.6 Ghz.