Yosemite gets stuck at startup

start up progress bar gets to about 30% then just stops, disc can be heard reading for a while before it just goes to a black screen.
have booted to recovery disc and verify says disc is ok. yet cannot get it to boot up.
have re-installed yosemite, and it did boot up but the screen was flickering i then installed 10.10.1 update restarted and it would not boot up again.
have ran fsck, it gives me the ok.
strangely i cannot get it to boot into safe mode.
can restart the computer to a mavericks installation and a lion installation on different discs with no problem
and can also boot to a yosemite install on a different partition on the problem disc.
is there anything else i can try.
thanks in advance.

hi thanks for getting back
tried all of those but didn't get anywhere.
did run an etrecheck which brought up a problem with launch daemons something regarding com.apple.updatesettings.plist
and update settings tool.
i got rid of the .plist file and restarted to no avail.
ie no restart. reinstalled Yosemite, I get in once but then not again on restart.
So I then erased the disc and went for a clean install and now it works. am now slowly getting back to where it was at before this problem arose reinstalling apps etc etc. didn't want to restore from a backup in case this reintroduced the same problem.
Anyway thanks for your help, and Happy New Year.

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