I can't log on to my I mac Desk top, every time I switch it on all I get is a white screen with the apple log , can anyone help pls?

Hello,
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitirion & use Disk Utility from there.

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Look at this support article:
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Hey HJA96,
Thanks for the question. I understand that your MacBook Pro is booting to a gray screen. The following article addresses this symptom, and provides relevant troubleshooting information:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
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Welcome to the Apple Support Communities!
This situation does sound very frustrating. I know that you have tried some great troubleshooting steps already and the issue remains unresolved. Have you forced the Mail application to close and then opened it back fresh? If not, this is the next troubleshooting step I would suggest. Please let me know if the issue remains unresolved.
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Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
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Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
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This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it produces. Look for the line "Permissions repaired successfully" at the end of the output. Then reboot as usual.
Step 6
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
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Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
Step 8
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

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I can't log on to my I mac Desk top, every time I switch it on all I get is a white screen with the apple log , can anyone help pls?

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