2010 iMac 21.5 won't boot up , froze at white screen! HELP!

Hi, everyone I need help! This morning the batteries ran out in my wireless magic mouse so I put in new batteries... Then all of a sudden by computer began to freeze and the colorful pin wheel began to spin and it was unresponsive! As my mouse couldn't get connected to my Mac ...
Every time I start my Mac It won't load past the white screen :(
And so I turned off my iMac and restarted it, it turned on and I heard the chime, it looked ok although it froze at the apple logo for 4 mins and a loading bar came under it and then as it finished loading the apple logo disappeared and the whole screen just went bright white and it just freezes, I can't use it !
Although when I boot up my iMac in safe mode it starts after about 10 minutes ... And everything appears ok just laggy but I guess that's what safe modes like, well anyway I went into disk utility and I verified the disk and permissions and repaired the disk and all that... And still nothing works, i also tried resetting the PRAM and still nothing has fixed it
My Mac is backed up with time machine, although when I bought my iMac it only came with snow leopard and now it's running lion... Although my friend installed it onto my computer a week or two after lion came out . And it's been perfect until now...
Please help! I don't know what to do next!

Ok now when I turn on my Mac, I don't even hear the chime, just displays a white screen. That's it, please someone help me I'm desperate here, In less than 5 days my warranty is over! :(

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Read this article... It recommended something you did already but there are other troubleshooting tips I'm not sure you've tried.
http://support.apple.com/kb/TS2570
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If that doesn't work, call back...
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The boot sector of the drive is fine or you'd never get to the gray/blue screen.
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http://support.apple.com/kb/HT1379
SMC:
http://support.apple.com/kb/HT1411
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Hello Again Reelsick Productions!
As I Previously Replied, in your Other Topic;
What size is the Hard Drive, and how much space is available?
How much RAM is installed, and is it original or added?
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Hey tom and welcome to Apple discussions,
It had been bogging down lately, and making a few clicking sounds plus the usual whirring.
Sounds like the hard drive going bad.
Today I wanted to check hard drive, so I put in G4 install/recover DVD 1 of 2 for 10.3 & restarted with Control key.
Yah usually it's not going to like that since it's a machine specific disk.
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This way?
http://support.apple.com/kb/HT2285
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Yes but it's $16 vs $5 at OWC. Most likely you'll need a new HD and the proper installer.
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My MacBook pro won't recognize hard drive I put in it. It boots only to a white screen unless I boot to my recovery USB. If I do that then I can select my USB and my external time machine drive in the disk utility, so no problems there. But what do you think it is? It won't recognize any hard drive I put in the machine, so might it be the sata cable?

Boot the Recvoery USB, use Disk Utility to select the internal drive makers namea and size on the left.
Now select erase and select the midde option and click erase, it will take a bit to complete but it's best for the drive.
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see
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<Re-Titled By Host>

Did you mean Command + Option + R for internet recovery?
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http://support.apple.com/kb/ts1440

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imac wont boot - i get a white screen with apple logo, and it loads to about 10%, then screen goes black

Hey there mtriest,
It sounds like you are unable to boot the iMac successfully as it keeps shutting down when you try to boot. I suggest the troubleshooting from the following article named:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Disconnect, test peripheral devices and network cables
Note: "Peripheral devices" refers to external devices other than what came with your Mac, such as hard drives, printers, or hubs that you connect via a USB or FireWire cable.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).
Disconnect any Ethernet cables.
Start up your Mac.
If you can start up this way, one or more of your peripheral devices (or installed software related to the device) is probably causing the gray screen issue. Connect one device, then restart your Mac to test for the issue. Repeat the process until you locate the device at issue. Make sure the device is powered if it needs to be to operate correctly. Check with the manufacturer of the device for support or possible software driver or firmware updates that may be available for the device. Try a different cable with the device if possible (such as a different USB or FireWire cable).
Note: If you have multiple peripheral devices and the issue only occurs when they are all connected, but not when each device is the only peripheral connected, see the Additional Information section below.
If you are using a desktop Mac with a third-party keyboard and/or mouse device, and the issue still occurs, try starting up with an Apple keyboard and mouse connected instead. Try starting with no keyboard and mouse connected, then connect them after start up. Also, try a different USB port on your Mac.
If the gray screen issue persists with no devices connected, go to the next section (with the peripherals still disconnected).
Perform a Safe BootSimply performing a Safe Boot may resolve this issue.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Start your Mac, then immediately hold the Shift key. This performs a Safe Boot. Advanced tip: If you want to see the status of a Safe Boot as it progresses, you can hold Shift-Command-V during start up (instead of just Shift).
Note: A Safe Boot takes longer than a typical start up because it includes a disk check and other operations.
If your Mac starts up as expected, immediately try restarting.
If the Safe Boot does not work, or the restart after a successful Safe Boot does not work, go to the next section.
There is additional information in the article with further troubleshooting if needed.
Thank you for using Apple Support Communities.
Cheers,
Sterling

2010 iMac 21.5 won't boot up , froze at white screen! HELP!

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