I need to know how to correctly install the PRAM battery Imac
I replaced the PRAM battery on my Imac and it hasn't worked since. It will boot from a CD but not from the hardrive. I've reinstalled the OS but that didn't help.I booted in single user mode and it said it can't load a particular driver. I tried again and it had a kernel panic.It will still boot from a n Install Cd but not from the hardrive.
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You must remove the back panel and press the pushbutton on the motherboard by the 3 leds. If that does not work then you may have the dreaded power supply or capacitor failure. Search the web and youll understand. There are some fix it web sites but if you still have applcare take it in to a apple store and they may repair or even replace the unit.
try resetting the SMC and the NVRAM. This occasionally stores the startup state and any keystrokes used during boot. Common issue with all intel macs.
Resetting PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
To reset the SMC on an iMac
1. From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button for approximately ten seconds until it powers off).
2. Unplug all cables from the computer, including the power cord.
3. Wait at least 15 seconds. The SMC reset occurs automatically once the iMac has been unplugged from the AC power source for several seconds.
4. Plug the power cord back in, making sure the power button is not being pressed at the time.
5. Reconnect your keyboard and mouse to the computer.
6. Press the power button on the back to start up your computer.
Note: The iMac does not have a button on the main logic board for resetting the SMC, which eliminates the need to remove the computer?s cover to reset it (as required for some other models).
There are several reasons why you could be having this problem. You first need to know a little about the various "flavors" of Apple computers and operating systems.
There are two brands of processors: PowerPC (this is what you have) and Intel (what Apple switched to after your model).
There are also different types of system install disks: Specific Version (this is what would have came with the iMac originally and contains only the drivers for that model). Retail Version contains drivers and "Universal" processor code for all of the supported models and both types of processors.
Intel Macs format their drives differently than PowerPC macs. So, if the used drive was formatted for Intel you wouldn't be able to mount it, if the install disk that was used was Specific Model type rather than Retail type when the system was installed on your used disk, you wouldn't be able to mount it either.
The drive you have must be formatted for PowerPC and system installed from either the Specific Version or Retail install disc in order for you to mount it.