Background

The iMac G5 was originally released in August 2004. It uses a PowerPC 970 processor which Apple dubbed the “G5.”

The iMac G5 was updated in May 2005 with the addition of an ambient light sensor (ALS) and small updates to the processor speed and hard drive capacity. With this addition, the new revision (called the “iMac G5 Ambient Light Sensor”) can automatically adjust the screen brightness based on your surrounding light conditions. Since this model is very similar to the original, they both have the same model number and the same iFixit repair guides ([[Topic:iMac G5 17" Model A1058|17-inch]] and [[Topic:iMac G5 20" Model A1076|20-inch]]). Apple released another update in October 2005 to add an iSight video camera just above the screen. Again, the new revision brought a bump in the specifications, but it also has a redesigned interior; therefore, the guides for the iSight model are different. Unfortunately, the opening procedure for this final iMac G5 model is more difficult than for the previous revisions.

The first two iMac G5 models have support for a 100x100 mm VESA mount so you can attach the device to a third-party arm. The later iSight model does not support this feature. It does, however, support faster DDR2 memory and a larger 2.5 GB maximum capacity. All versions of the iMac G5 can run up to Mac OS X 10.5.8 “Leopard.”

Identification

The all-in-one machine uses the same display found in the previous iMac G4, but all the internals of the G5 are inside a rectangular case just behind the display. The main body of the machine is held up with a curved aluminum foot, a piece of design language that stuck around in the product line for many years. You can identify this machine by looking for the EMC number (e.g. EMC 1989) printed on the bottom of the aluminum foot.

Technical Specifications

Model numbers

• Original:

  • 17-inch: A1058 and EMC 1989

  • 20-inch: A1076 and EMC 2008

• Ambient light sensor:

  • 17-inch: A1058 and EMC 2055

  • 20-inch: A1076 and EMC 2056

• iSight:

  • 17-inch: A1144 and EMC 2081

  • 20-inch: A1145 and EMC 2082

Processor

• PowerPC G5 970FX

• 1.6 GHz through 2.1 GHz

Memory

• Original and ALS: 256 MB of 400 MHz DDR

  • Upgradeable to 2 GB

• iSight: 512 MB of 533 MHz DDR2

  • Upgradeable to 2.5 GB

Storage

• 80 GB, 160 GB, 250 GB, or 500 GB hard drive

• 3.5-inch form factor

• SATA interface (PATA on education models only)

Display

• 17-inch: 1440x900 pixels

• 20-inch: 1680x1050 pixels

• Matte finish

• 16:10 aspect ratio

Connections

• Three USB 2.0 ports

• Two FireWire 400 ports

• Ethernet port

• Modem port (not on iSight model)

• 3.5 mm headphone jack

• 3.5 mm audio input jack

Wireless

• Airport Extreme 802.11b/g Wi-Fi (optional on original model)

• Bluetooth (optional on original model)

VESA bracket

• 100x100 mm

Additional Information

iMac G5 on Wikipedia

iMac (all models) on Wikipedia

iMac specifications (all models) on EveryMac

iMac G5 on Apple-History

iMac G5 (Ambient Light Sensor) on Apple-History

iMac G5 (iSight) on Apple-History