Help with white screen on startup PLEASE!

My new imac is only showing a white screen on startup. I am not really confortable with mac's yet to start trying a bunch of different things, I did try a restart where you press four buttons (p and r restart I think).
I made an appt. tomorrow for the mac store. My question to you is, is this a hard drive issue. I have read a little that others have had this problem...did you loose everything on your hard drive?
Thanks guys,
Michelle

To add to the conversation, my iMac has decided not to start up any further than the grey screen with apple logo and scrolling symbol. I haven't a clue what to do with it!
I tried doing a safe boot but that didn't work. I then tried to access the disk utility repair but i upgraded the operating system on my comp to tiger so i don't know if i should be using that cd or the one that came with my computer thus old operating system.
If anyone could shed any light on this i'd be most gratefull.. i hear reports of needing a replacement hard drive.... nooooooooooooo

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White Screen on Startup - please help

Hi,
I'm having problems starting up the imac when i have an external usb hard drive connected. When I turn the computer on or restart, it will freeze on a white screen until i manually turn it off by pressing the "off" button.
I'm pretty sure its the USB drives, as this doesn't happen when I have them disconnected, but its really troublesome having to disconnect and reconnect everytime i want to restart.
I have the startup disk specified in preferences for the windows partition in the internal hard drive. (the external hard drives that are causing a problem are not being used to boot)
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Just for clarification, upon looking up this problem i have noticed many saying this has happened to them but before the macbook pro would boot, it would chime and then freeze. My macbook pro is chiming and booting and even letting me log in, it's then that i get a white screen. Hope this clears things up.

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Topic clear..
After starting white screen with apple logo (not clear) and in a min screen turns off.. Can you identify what my problem with? lcd panel? graffic card? or else?
Screens:
http://cid-b0bc35141d9aad6e.skydrive.live.com/self.aspx/imac/ss1.PNG
http://cid-b0bc35141d9aad6e.skydrive.live.com/self.aspx/imac/ss2.PNG
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That are very strange pictures. That looks like a Graphic Card issue but I was having almost the same problem only my Apple Swirling Gear Looks Normal. But the Swirling Gear stops at about 1 or 2 turns & just freezes & sits there indefinitely. First some said Hard Drive but the Tech ran Tests & the HD Passed. The Senior Tech from Apple said it was the Logic Board. So the Logic Board is being replaced tomorrow.
Can you boot up to the Install Disc? I couldn't. At first I could get it to startup by Pressing Power Button & trying 10 times in a row. Same with Install Disc. It kept turning & making a lot of noise, but would not boot to Disc. I finally got the Disc to Boot & did an Erase & Install, but I still had the problem. I would see if you can do an Erase & Install first.You may get Lucky & your problem might just be Software related. Mine was not.

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hy every one..............
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If you are still using Snow Leopard -
Shut down your computer and disconnect all peripherals (keyboard & mouse if pertinent) from your computer. Now reboot.
If the Mac starts up normally, shut it down again and then plug in one of the peripherals (keyboard or mouse first) and start up your computer again. If it does so successfully repeat the process, adding one peripheral at a time until your Mac acts up. At that point, disconnect the last peripheral you added, reboot your Mac and search the peripheral vendor's website for an updated driver.
If no driver exists or the problem remain after installing the new driver, try a different cable or a different port on your Mac.
If none of the above works, again disconnect all peripherals from your Mac, hold down the "shift" key to start up in "Safe Boot" mode.
If the Mac starts up correctly, restart without pressing the "shift" key.
If your computer still does not start up properly, shut it down and restart it while holding down the Apple+Option-P-R keys; keep holding "all 4 keys" down until you hear the startup sound "twice."
If none of the above work Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
(If Disk Utility cannot repair, you will need a stronger utility (3rd party) - Diskwarrior or Techtool PRO)
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.
Remove any 3rd party ram.
Reinstall Snow Leopard - This will install a "fresh" copy of Snow Leopard without archiving old system files but leaves the rest of your files in place.
If your computer is still under warranty or you have Apple Care, take full advantage of it by letting tech support deal with your problems. It's what you're paying them for.
Out of warranty - take the computer to an Apple store or an AASP. Whichever is more convenient for you.

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It pauses on the white screen for how long, does it finally go through?
Hold the Shift key down while booting,
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If you get into the machine, then do #9 - #13
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Safe Boot is perfoming a disk integrity check and repair process which may take a long time. Let it complete, though if the startup disk requires repair to begin with, it is likely already in a failed state.
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In a situation such as yours, I tend to consolidate items into folders so I have folders of nice workable numbers of images, somewhere between 20 and 200 images. Now, whatever, once you've imported, do your moving within LR, not the OS! I will select all in a folder and drag into a folder a level or two or three above, and then delete the newly empty subfolders. I hope this helps a bit!
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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
- 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.
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
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Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Go to Settings>iTunes and App Stores and sign ut and sign back in
- Reset all settings
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:
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- Restore to factory settings/new iOS device.
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
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Also see:
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Please Help: iMac black screens after startup logo + spinning wheel no cursor).

Hi, guys.
I'm in a fair bit of a desperate situation; my iMac's screen seems to shut down every time after the white startup screen. The Apple logo appears, & the progress wheel begins spinning, then after a while - when it would usually then go to the gray login screen - it would, instead, go black. I can tell that the machine is still on (I can still hear it clicking as it does during processing) but I'm unable to determine anything else. Nothing is visible on the screen - not even the cursor - it's as if the display had turned off completely. I'm not sure if the login screen sits beneath that black screen (I have tried to log on by typing my login details in blindly, but even if it does log in, it's hard to determine what state the computer is in without seeing the screen.
I have tried the PRAM reset (holding CMD+OPT+P+R) during both the white startup screen, & the black screen to no avail. It seems unresponsive because I don't hear any additional chimes that I've been told should be heard during a PRAM reset attempt. I can't even be sure that the command is being inputted correctly because the light on my wireless keyboard remains off during the process.
I've tried rebooting over & over again; the results are the same.
The steps that led to the problem occurred thusly:
1 - I was trying to clear some memory from my current session, so I scanned through my active processes, quitting anything which seemed to be eating up considerable amounts of memory.
2 - One particular process I quit was 'launchd' which was functioning under my profile username.
3 - After quitting launchd, all opened apps seemed to close, & it looked like I was forcibly logged off the machine. The screen froze during this point, & I decided to do a hard reboot to log back in.
4 - The problem began after this hard reboot; startup seemed to occur as per usual; white screen > apple logo > progress wheel > and then suddenly, a black screen where the login screen should be.
I've shown a flashlight into the screen while it's black & it seems well & truly like the display has shut down while the iMac continues in the background. I have had issues relating to my screen going black before, but they were random & intermittent; they didn't occur without fail during the exact same time immediately after startup, & could be remedied by using the CTRL+OPT+EJT keys.
I am on an iMac 2010, 27", using I believe Lion OSX. I am unable to recall additional specifications while the problem persists.
Could anybody please help me? I'm quite desperate; I was in the middle of some urgent work that I need to get back to as soon as possible.
Thank you I'm advance to anyone with advice on how I can go about fixing this.
,c.

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HELP! my MacBook 13 inch stuck at white screen on startup

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For clarity, bringing up the Apple hardware test isn't booting to the operating system on the OS X DVD. You should use the original OS X DVD that came with your system that says 'AHT Version x.x' in small print on the label. Insert, boot holding the alt/option key, and choose the Apple hardware test. If that works, you want to run the extended test, which can take over an hour.

Help with white screen on startup PLEASE!

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