Mac screen has white and yellow bars on start up but no icons?

I have a 27" Mac Desk Top computer recently upgraded to Yosimite.
On starting up the screen appears white with yellow columns but no icons or dock appears?
Can I fix this myself?

Try booting into the Safe Mode using your normal account. Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
Safe Mode - Mavericks
You can also try resetting the PRAM.
Reset NVRAM/PRAM

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There is a known problem with a yellow tint on i7s. I suggest you call Apple Care and tell them about it, it should still be under warranty.

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Let the battery fully drain. After charging for an hour try:
- Reset
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Connecting to computer and try to restore.
- If still white scree then time for an appointment at the Genius Bar of an Apple store.

How do i fix my ipod touch the screen turned white and i tried to rest it but it wont work, what do i do?

I dont have Itunes because it slows my computer down so i dont know how to reset it.

Try:
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- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar
Sometimes the problem is due to a software glitch and seldom reoccurs. However, sometimes it is due to a hardwae problem.

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Try a reset. Hold down the sleep and home keys for about 20 seconds. When you see the silver apple, let go and let it reboot and see if that helps.

I turn my Mac on the screen is white and has a folder with a '?' In middle?.

I turn my Mac on the screen is white and has a folder with a '?' In middle?

•A Flashing Question Mark appears when you Start your Mac:
http://support.apple.com/kb/TS1440
Read through & follow the instructions; if the problem goes away after completing
any of them, you need not continue through all of them to resolve this issue.
This also helps troubleshoot some of the main possibilities.
Short of some hardware failure requiring major parts.
Good luck & happy computing!

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Do not attempt to charge as that will only make the damage worse. You need to take the MacBook Air to an Apple store genius bar and have the technicians check and see what repair work is necessary. It only takes a very small amount of liquid to cause short circuits and damage.

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My ipod touch 4th generation has frozen whilst being turned back on. The apple logo has been on the screen and ever so often the screen flashes white and then black. How do I get it to unfreeze at this stage?

Try:
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- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
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I have OSX 10.5.7 on my Intel Mac. When I try to login using the correct password the screen goes white and just returns back to the login screen. It does not jiggle like when you enter the wrong password.

I have had a number of issues with my Intel Mac recently and had to reboot using disk utilities, safe mode, OSX recovery, but always come back to the login screen but when I type my password the screen goes white and returns to the login screen. My password is correct and the login does not jiggle as it would if the password was wrong. Please advise,

Back up all data if you haven’t already done so. There are ways to back up, even if you can’t log in. Before proceeding,you must be sure you can restore everything to the state it’s in now. If you’re not sure you can do that, STOP.
The procedure below may spare you the need for a clean reinstallation of OS X. If you don't feel comfortable carrying it out, don't. try.
Briefly, you need to delete the following file:
/var/audit/current
If you already know how to do that, you can skip the rest of this message. Do it, and try again to log in.
Boot in single-user mode by holding down the key combination command-S at the startup chime. If you’re using an external USB keyboard, it must be plugged directly into a built-in port on the Mac, not into a hub. Release the keys when you see a black screen with scrolling white text. In this mode, there’s no graphical interface; just a command line. Initially, you can’t make any changes to files.
When the text stops scrolling, and you see a line ending in a pound sign (“#”), type the following command:
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Next, type the following command:
rm -i /var/audit/current
Press return. You should get the following output:
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If that's not what you get, STOP. Type the single letter N, press return, and try again. Otherwise, type the single letter Y and pressreturn.
Finally, enter the command:
exit
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Credit for this solution to ASC user AnthonyTW.

Stuck with black screen with Apple and download bar approx 1 quarter done. Downloading Yosemite. It has completely stopped. I can't access anything. Please help

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You should really read the manual.
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Restore. When given the choice, choose to use backup.
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HELP!!!! The screen on my mac mini has shrunk and I don't know how it happened and need to know how to change it back. It's really small print and it's hard for me to read.

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Click on the Apple logo in the upper-left corner of your display.
Click "System Preferences," then click "Displays."
Click "Display" if it is not already selected.
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Depending of the monitor you have.

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Back up all data.
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☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Select the login keychain from the list on the left side of the Keychain Access window. If your default keychain has a different name, select that.
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My ip adress was attacked by a bot virus,therefore my mac screen has been blurred as if the ink is poured on the surface,I want a solution to fix it?

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Let the battery fully drain. After charging for at least an hour try:
iOS: Not responding or does not turn on
If not successful time for an appointment at the Genius Bar of an Apple store.

Mac screen has white and yellow bars on start up but no icons?

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