12-month old iMac running Mavericks will not run Yosemite

I have an iMac 21.5", bought new in September 2013 and currently running Mavericks with no problem. The OS is on the internal Mac HDD while Time Machine is on an external HDD. Previous OS updates have installed OK.
Yosemite however will not run. After installation I can log in with no problem and all seems well -- the first time.  All attempts to log in after the first produce the Apple logo and progress bar, but the bar advances only about one third of the way and hangs up, even when left for an hour or more. Nothing at all can move it -- all I can do is reboot by powering off/on. No login appears, just -- the logo and progress bar, which starts to run then stops as before.
If I reinstall Yosemite then I get one login as before, followed by the same failure -- I have now re-installed three times.
I have tried rolling back to earlier (pre-Mavericks) OS versions on Time Machine before installing Yosemite -- same result.
Right now I am back on the previous Mavericks.  All is OK and I can live without Yosemite, but I am becoming concerned for future-proofing my apps. Newer versions, for Yosemite, are not going to run.
Any help would be appreciated please.
Best wishes to all.

Sadly it did not last. Yesterday it again froze on login and this time Safe Boot got me nowhere.
No doubt if I carry on experimenting I can sort it out,  but I can longer justify the long breaks from my work. I have rolled back via Time Machine to my last Mavericks-based save, and there it stays until someone at Apple gets to grips with Yosemite. Or replaces it, which I expect won't be long . . .
It just is not good enough to tell the consumer that  they must accept bugs with a new release, or that it's all their own, or their system's fault  or that they should get help from a support forum -- any clerk should be able to sit down and just use it. If a machine was running OK with an existing OS,  then it should seamlessly switch to the new without calling for a Masters in IT to figure it out. No ifs or buts. We pay  a premium price for a Mac and deserve better than this from Apple.
From my standpoint, Yosemite is without doubt the worst beast of an OS -- from any source -- that it has ever been my misfortune to encounter. This is my third Mac over the years, and at this rate it's my last -- for all Microsoft's failings, I have never encountered anything like this with Windows.

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