were upgraded with the more powerful Nvidia GeForce 9400M and later the 320M. While the MacBook Pro largely followed the industrial design standard set by the PowerBook G4, the MacBook was Apple's first notebook to use features now standard in its notebooks – the glossy display, the sunken keyboard design and the non-mechanical magnetic latch. With the late 2007 revision, the keyboard received several changes to closely mirror the one which shipped with the iMac, by adding the same keyboard shortcuts to control multimedia, and removing the embedded numeric keypad and the Apple logo from the command keys. A more expensive black model, with a larger capacity hard drive, was offered until the introduction of the unibody aluminum MacBook. The polycarbonate MacBook was the only Macintosh notebook (until the new 2015 model) to be offered in more than one color since the iBook G3 (Clamshell). The MacBook was Apple's second black notebook, after the PowerBook G3. Ports The ports are all on the left edge; on early models, from left to right, they are the MagSafe power connector, Gigabit Ethernet, mini-DVI, FireWire 400, 2 USB 2.0 ports, audio in, audio out and Kensington Security Slot. For the unibody polycarbonate MacBook (2009), the ports from left to right are the MagSafe power connector, Gigabit Ethernet, Mini DisplayPort, 2 USB 2.0 ports, audio out and Kensington Security Slot. On the front, there is a power light and an infrared receiver, while on the right edge, there is only the optical drive. User serviceability The polycarbonate Intel MacBook is easier for users to fix or upgrade than its predecessor. Where the iBook required substantial disassembly to access internal components such as the hard drive, users only need to remove the battery and the RAM door to access or replace the internal hard disk drive. Apple provides do-it-yourself manuals for these tasks. Quality problems In February 2007, the MacBook was recalled because the graphics card and hard drive caused the computer to overheat, forcing the unit to shut down. Some early polycarbonate MacBook models suffered from random shutdowns; Apple released a firmware update to resolve them. There were also cases reported of discolored or chipping palmrests. In such cases, Apple asked affected owners to contact AppleCare. There were problems with batteries on some models from 2007 not being read by the MacBook. This is caused by a logic board fault and not a fault