Can't reset my systeem admin account and all startpunt options respons with a grey screen, lock and line for password

i bought a 2nd hand iMac 21'5, 2010. First I installed Mavericks and entered a password which I forgot, and did not activate my appleid at that time.
when trying to install a new bought program, I had to enter the sys adm acoount password which I had forgotten.
TRied the options found on internet, but did not have a mavericks startup disk. downloaded Mavericks again and then tried to creatie a startpunt disk. did not work as mavericks immediately started with the installation.
Got the original Mac os X cd from the person I brought the iMac from, but now found that I cannot use the CMD r option. then my Mac opens with a grey screen, a lock and only allow a password input.
None of the startup options (eg d) are working anymore and or end up in the grey startup screen asking a password or just ingenomen the request and starts the Mac and is fully operational without full access to the systeem functions (as these require the systeem password which I forgotten). However my Mac still starts and I use mail and internet Ans all other installed programs. but I cannot create an account as I do not know the sys adm. password.
When using terminal and give the command mountain -uw / I receive the reply:
GetMasterBlock: Error 13 opening /dec/rdisk0s2
mount-hfs: Operation not permitted.
CAn somebody help me how to reset my system, even if this means I loose all data? I bought all software in the iStore, so asume I can re-install it anyway.

Ask the person you bought it from for the firmware password and supply that into the box. You'll then be able to use the Option key shortcut and can get into the recovery partition to reset the administrator password.
(109777)

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Start-up grey screen lock and waking issues

Hello, I've been having several problems with my iMac G5 that seemed to all start at the same time just in this last week:
1/ Trouble starting computer - during start up the usual tone is heard, then a grey screen appears and the start up process stops. I am forced to restart and try again. After several attempts the computer makes it to the grey apple logo and it finally starts up. The computer works perfectly once it is finally on all of the way - except for the following sleep thing . . .
2/ computer won't start up again after sleeping - EITHER screen remains black and fan noise is heard, OR screen image comes back but then distorts slightly, a dark gray washes over it, and a restart notice appears (also distorted).
I have tried the follwing techniques to fix the problems:
- Disc Utility check: everything fine
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- Re-set PRAM
- Tried starting holding down Option Key - had to shut down after endless wait
- Looked for new firmware - what I found didn't help
- Removed new Software - no change
- Tested with various peripherals disconnected - no dice
I have NOT tried Safe Boot - safe mode would turn off many of the functions I use most.
I'm not sure what else I can do. I am, of course, aware of the "Repair Extension Program for Video and Power Issues" but as I live in Japan, outside Tokyo, it is going to be a long haul to get my computer in to be looked at.
Could this be fixed any other way by me? Or does this sound like a classic "G5 power/video issue" and I should just bite it and take it in?
Many thanks for your time in replying,
Corrie B.
iMac G5 Mac OS X (10.3.9) First Generation
iMac G5 Mac OS X (10.3.9)

"I'm not sure what else I can do. I am, of course, aware of the "Repair Extension Program for Video and Power Issues" but as I live in Japan, outside Tokyo, it is going to be a long haul to get my computer in to be looked at.
Could this be fixed any other way by me? Or does this sound like a classic "G5 power/video issue" and I should just bite it and take it in?"
Hi Corrie, welcome to Discussions. Unfortunately I think you hit the nail right on the head. I would find a way to get this done with extension program because paying to fix it maybe cost inhibitive. (could you ship it to a friend or relative in the USA and have them take it in)???
For the sleep/wake issue you can try resetting the SMU, read the link below and it will show you how. Good luck Bob
SMU reset

Hi I have just been given a macbook 13'' A1181 it has a brocken screen so I have linked to my dell screen and all I get is my sons old screen saver and the arrow but cannot open anything where ever I click. Any suggestions please my first apple

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You have the display set in Extended Desktop mode. In System Preferences>Display there should be an Arrangement tab when you have the MacBook hooked up to the TV and both screens working. When you click the Arrangement tab do you see two monitors side by side? One of them will have a Menu Bar at the top. Just click on the Menu Bar and drag it to the second monitor. That will make the second monitor your main screen.You can now use your MacBook in Clamshell Mode with a wired or Bluetooth keyboard and mouse. http://support.apple.com/kb/HT3131When you disconnect from the TV your Menu Bar will automatically change back to the MacBook.
Or if you want to work on the MacBook screen while showing it on a TV you can check the Mirror Display box on the lower left hand side of the Arrangement tab under the two monitors box.

Why do I have to sign in after screen lock and/or sleep?

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You need to change the settings in each app. I don't use YIM, but Skype and Facebook I do use.
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Under Settings >> Notifications, make sure they are on, and the types of alerts are on (Badges, Alerts, and/or Sounds).
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My old email address was hacked and I am no longer able to access it. How can i reset my icloud ID without losing all of my pictures and more inportantly contacts? I have created a new ID but i cannot seem to use it until I delete the old account

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You need to use the old ID and password to delete the iCloud account. After you delete the old account, you can sign in with the new ID in iCloud.
Have you seen this.
http://support.apple.com/kb/HT5796
iCloud
iOS 6 and later: Go to Settings > iCloud.
If you signed out before changing your Apple ID, enter your current Apple ID to sign in. The data from your iCloud account will download to your device.
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I am very confused. When I wanna to update my apps in app store, it shows the account which is my iPhone one is not my iPad one. how can I reset to my iPad account?

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And I am very confused by your query. Your iTunes account is the same on all devices - unless of course you have multiple accounts to begin with.
If you do have another Apple ID that you use for the iPad purchases, you can sign out of the account that is on the iPad in Settings>Store.
Perhaps a few more details from you could clear up the confusion???

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Hello sadiepix,
The following article details several things that can be done to quell iTunes' constant need for authorization.
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
http://support.apple.com/kb/TS1389
Cheers,
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I've forgetten my password ID and I can't restore it though you send me an e\mail for it but the e-mail isn't arrive to my account at all. what am I suppose to do in order to restore my password ID?

I've forgetten my password ID for ([email protected]) and I can't restore it though you send me an e\mail for it but the e-mail isn't arrive to my account at all. what am I suppose to do in order to restore my password ID?

http://iforgot.apple.com

My computer continually asks me to enter my password for Keychain access. This problem is continuos and I am having trouble with eliminating it. I have changed my password through Security and my Accounts numerous times to no avail. Is there anythin

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Back up all data before proceeding.
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Hi, just updated hubby's iPhone 4 and all of his music has disappeared from the iPhone and from the iTunes library! He does have music still stored on his iPod, but can't get it from the library on his iPod back to phone or itunes. technophobe help pls!

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Sounds like the music you had on your phone was not the same music on his computer. The iPhone/iPod touch is not designed to be a storage device. When you sync with a computer that doesn't have your music, it deletes your music from your phone.
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How can I download itunes when I get the following errors...have installed and uninstalled a dozen times with various fixes...b noir for example and used Revo to clean up..ituneshelper did not install correctly error 7

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billymac

Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features(Later)
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iTunes
Apple Software Update
Apple Mobile Device Support (If this won't uninstall press on)
Bonjour
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See also HT1925: Removing and Reinstalling iTunes for Windows XP or HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
Should you get the error iTunes.exe - Entry Point Not Found after the above reinstall then copy QTMovieWin.dll from:
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tt2

How can I use screen lock and auto-logout together?

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Thanks for using Apple Support Communities.
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Can't reset my systeem admin account and all startpunt options respons with a grey screen, lock and line for password

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