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If you're unable to start your Mac in Safe Boot mode, or your Mac starts in Safe Boot mode, but it won't start up normally, you can try the following:
I pressed the power button and pressed the Shift key immediately after the startup tone. I got a blue screen and the Apple icon. I held the Shift key for over five minutes and nothing else happened. I released the Shift key and got the Apple icon, the spinning gear and a progress bar lower on the screen. The progress bar went about 1/4" of the 3 1/4' length and then shut down the computer.
I never got to the Safe Boot mode. I have tried the procedure above more than once to be sure I was doing the procedure correctly and I get basically the same results.
I looked at the descriptions for Reset PRAM and Reset SMC. Which should I try?
I tried the Reset SMC. I unplugged the Mac. Then, pressed and held the power button for a little over 15 seconds, reconnected the power cord, waited a little over 5 seconds and started the Mac. The result was a blue screen, the Apple icon, the rotating gear, the progress bar moving about 1/4", and then shutting down the Mac.
I was ready to try the Reset PRAM but the procedure calls for pressing and holding down four keys simultaneously one of which is the Command key. Is this Command key the same as the Control key? I don't want to mess up the computer further.
My iMac keyboard has Control, Option, and Apple keys. The Macbook laptop computer I am using to type this message has fn, control, option, and command (Apple pretzel). I'm confused with your answer.
I tried the Restart PRAM. I started with the computer off. I turned on the computer and before the grey screen appeared, I pressed and held the Control, Option, and the P and R keys. The grey screen had the Apple icon, the spinning gear, and restarted on its own. Upon hearing the startup chime, I released the four keys. The Apple icon, rotating gear, and a progress bar appeared. After the progress bar reached about 1/4" on the 3 1/4" bar, the computer shut itself off'.
I repeated the procedure with the four keys being Option, Apple, P and R. The results were the same as above.
I have read through the information about AHT. I am not sure exactly what to do. My initial installation was OS 10.4 and the current OS is 10.6.8 Also, it appears that most of the procedures require that the computer be up and running. Please take me step by step through the AHT. Thanks.
I will look. It will take me a few minutes,
Okay, I hope you have the disk. I need to go now. So let me give my suggestions. Sometimes a disk error or permission related error will cause file corruption. In such a case mac will become unstable. So, first try to Repair Disk Permission. You need to use Disk Utility to Repair Disk and the Repair Disk Permissions. Check this tutorial to see how to use disk utility for these functions.If it not helps, you need to re-install mac osx. Your files and settings will not be touched as long as you don't specifically tell the installer to erase them. Follow below steps to re-install osx.1. Insert your Mac OS X Install DVD or Installation Disc 1.2. Restart the computer and hold down the letter "C" as the computer starts up.3. Continue to hold down the letter "C" until you see a grey screen with an Apple and a small spinning gear.4. Select your language on the Welcome to the Mac OS X Installer screen and click "Continue".5. Click "Continue" on the following screen.6. After reading the Software License Agreement, click "Agree".7. Select the volume to which you are going to install. "Macintosh HD" is the default name.8. Click the "Options" button in the bottom corner of the window and select your installation type.9. Click "OK" and then "Continue". You will be presented with a confirmation window at which point you can click "Install" to proceed.I hope re-install will fix the issue. Try and let me know the result.RegardsJins
I found two grey disks - Mac OS X version 4.8 Install Disc 1 and Install Disc 2.
I also found another disk - Mac OS X Leopard Install DVD version 10.5.
Which one should I use?
I inserted the Leopard install disk and then powered up the computer. The Apple icon, spinning gear, and progress bar appeared. The progress bar went about 1/4" and then powered down the computer. I tried this twice and got the same result both times. Now what can I try?
The Leopard disc is in the computer. I turned on the computer and the Apple icon, the spinning gear, and the progress bar appeared. The progress bar went about 1/4" and the computer turned off. Now I don't know how to get the Leopard disc out of the computer.
I will try AHT as you suggest. I think I should use the Section, "Using Apple Hardware Test on computers with OS X 10.5.5 to 10.6.7" because the last sentence says to go to the Section for OS version 10.7. BUT WHAT INSTALLATION DISC DO I USE? It seems that I will not be able to get to the AHT program because the computer isn't even reading the disc.
I do not have any discs for the Snow Leopard; I downloaded the update from the computer.
I can't get the computer to read the Leopard disc. I tried holding down the "C" key while powering up. It didn't work.
I figured out how to get the disc out of the disc drive on the computer.
ARE YOU GETTING MY MESSAGES?
Sorry for the delay in reply. Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).Disconnect any Ethernet cables. Then try to boot your system.
If it not helps, the error is with the hard disk. So you need to buy a third party utility to repair your disk. I like to suggest Disk Warrior or TechTool Pro, with Disk Warrior being the more popular of the two. As long as there is not a hardware issue, Disk Warrior can usually repair what Disk Utility cannot. Disk Warrior is available from http://www.alsoft.com/diskwarrior/Click here to seehow to boot from disk warrior cd.
You are not able to boot your system, then another option is connecting your system with another mac machine with a firewire cable to perform a targetmode boot. Click here to see how to use and troubleshoot FireWire target disk mode
Otherwise you need to take the disk from the system and then you can connect the drive to a sata-to-USB adapter or put it in a hard disk enclosure then connect it to another Mac system. From there, depending on the level of corruption you should be able to copy data from the disk or can repair the disk with third party tools.
It seems that you are suggesting that the problem is the hard disk drive. Is that right?
I had disconnected all peripheral devices but one thing I had never thought of is that I was using a wireless keyboard and mouse. I replaced those with a standard keyboard and mouse. Then, I tried the Leopard install disc using the "C" key when I started. The Leopard install disc OS v 5 came up on the screen.
I was going through the install process very slowly when I began to get instructions that made me extremely nervous. Some steps said that if I performed the install I was going to lose all my data/files. Since I have over 800,000 files, I backed off and ejected the install disc.
So, it may have been all along that I couldn't open the computer because something was wrong with the wireless keyboard or mouse.
If disk repair using disk utility not helps, you need to buy a third party utility to repair your disk. I like to suggest Disk Warrior or TechTool Pro, with Disk Warrior being the more popular of the two. As long as there is not a hardware issue, Disk Warrior can usually repair what Disk Utility cannot. Disk Warrior is available from http://www.alsoft.com/diskwarrior/Click here to seehow to boot from disk warrior cd.
I want to thank you for your help. I know this has been a difficult problem to solve and you have systematically moved through the tests. I have just purchased DiskWarrior at your suggestion and after reviewing the advertisement/information for the DVD. So, I believe we are done with the project.
I have one important suggestion: tell everyone that you help to make sure they use a standard keyboard and mouse - do not use a wireless keyboard and wireless mouse. That may have saved use some time.
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