Re: F15A live cd probs installing to hard drive?
I don't think the fault is general.
I've installed the KDE F15 alpha live CD three times in the past couple of days with no problems.
However, two thoughts for you.
It "may" be hardware specific, in which case a bug report with hardware information may help. It's what the testing phase is about.
Or, in all my installs, I'd created blank space on my hard disk first using PartedMagic, and then took the option to install into free space.
Might be worth trying that as it could help nail down where the problem lies.