My computer is completely frozen, after two days of installing yosemite

Two days ago I did the Yosemite update. I did the vault security encryption because it was suggested. After it, the login was taking longer than before, but the laptop was working fine. Then I shut down the computer from the initial page after it was asleep, and then I took it with me. When I turned it back on, all normal, the pages I was reading were there, and after a couple of hours of using it, it began to freeze, doing nothing but the horrible rainbow circle. I had to force quite. It restarted normally, but once I opened an application it just stayed loading there. Again forced shut. The same thing. The following time it just didn't even go into the desktop, just a blury background and the horrible rainbow. Nothing else happened. Sounds like Yosemite just screwed my computer, and now I have to wait until Monday for a technician. Does someone have a clue of what could've happened?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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