Computer does not retain parameter Ram Pram settings

  1. If the computer does not retain parameter RAM (PRAM) settings when it is turned off, this generally indicates that the battery needs to be changed.
  2. Measure the voltage of the battery in the battery holder (see graphic below). The battery should measure 2.6V to 3.0V. If the battery does not have minimum voltage, replace the battery. After replacing the battery, wait 10 seconds and then reset the PMU (refer to Reset the PMU mentioned in this chapter).
Apple Mac Battery Replace
  1. If the battery voltage is good, reset the Power Management Unit (PMU). Refer to: Reset the PMU mentioned in this chapter.
  2. Test the computer and return it to the customer.

The computer automatically performs a power-on self test when it is turned on after being fully shut down (not a restart). This section describes what to do if beeps are heard during the startup.

Note: The computer has a memory expansion slot that accepts a 1.25-inch (or shorter) PC-100 compliant, SO-DIMM memory card. Refer to the Memory Replacement instructions for removal and installation.

Computer beeps at startup

1. Check that the memory DIMM is compliant. The Mac mini computers have a single memory slot. The slot accepts a standard PC2700 or PC3200 184-pin DIMM with the following specifications:

  • PC2700 or PC3200 Synchronous DRAM (SDRAM)
  • 2.5 volt
  • 8-byte
  • non-parity
  • 64-bit wide
  • 184-pin module
  • maximum of 16 memory devices on the DIMM
  • unbuffered—do not use registered or buffered SDRAM
  • maximum height of 50 mm

The Mac mini has a 256 MB base memory configuration, which can be expanded up to a maximum of 1 GB.

  1. Reseat the memory into the slot.
  2. Replace the memory.
  3. Replace the logic board.

The optical disc drive does not accept discs (mechanical failure)

  1. Verify disc is not warped.
  2. Try another known-good disc.
  3. Reseat the optical drive to the interconnect board.
  4. Replace optical drive.
  5. Replace the interconnect board
  6. Replace the logic board.

The disc icon does not show up on the desktop, or a dialog box appears to initialize disc

  1. Verify the correct type of disc is being used for the type of drive (a CD-ROM or CD-RW drive reads CD discs only; a DVD-ROM or Combo drive reads CD or DVD discs).
  2. Try cleaning the disc. If it is dirty or scratched, it may not mount.
  3. Try a different disc.
  4. Reseat optical drive to the interconnect board.
  5. Replace optical drive.
  6. Replace the interconnect board.
  7. Replace the logic board.

The optical drive does not eject the disc

  1. Verify disc is not in use by quitting any applications that may be using the disc.
  2. Press and hold Media Eject key at top right corner of Apple keyboard. If that does not work, hold down Function (fn) key and Media Eject key.
  3. Drag disc icon to trash or select it and press Command-E.
  4. Choose Restart from Apple menu while holding down the mouse button.
  5. Refer to Take Apart to remove the stuck disc and replace the optical drive. Related article:

106752: Macintosh: How to Eject a Disc When Other Options Do Not Work

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  • mewael bisrat
    What does parameter ram reset do?
    9 years ago
  • gino
    How does a computer retain memory?
    9 years ago
  • virpi
    Why Mac pro does not retain parameter RAM (PRAM) settings when it is turned off?
    9 years ago
  • akseli
    How to short a reset pad after changing a battery?
    9 years ago
  • Iolo
    How to replace the pram battety of an mac g5 power pc dual 2.5?
    9 years ago

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