Yosemite will not start - stalls all the time. Cannot use MacBook

Installed Yosemite when it was released.
Has worked fine until today.
When waking up from sleep, went into spinning beach ball mode. Tried restarting but stayed the same.
TRied reinstalling Yosemite but this made no difference.
have Yosemite Beta on separate partition. Booted to this, started ok but went unresponsive after a few minutes
help!

hello,
all the temperature apps(smcfans, istat, temperature gauge) sense the temperature only when i'm charging my mac or when the mac start to become hot. at the rest of the time it just stuck on tne lest temp he sense.
i use now macbook pro retina 13 heswell and in my old macbook air 13 sandy bridge the temp apps sense the temp all the time like it should be.
is it normal? is it part of the "haswell saving energy”?

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