Apple iMac 20" A1224 Series Intel Socket mPGA478MN All-In-One Logic Motherboard 820-2143-A.

Apple Part Number: 820-2143-A
Compatible Part Numbers: 661-4437 661-4439 31PI8MB0000
Compatible Models: Apple iMac 20" A1224 MA876LL/A MA877LL/A 2007 Series

Please Note: This motherboard does NOT come with a CPU.

Specifications:

Intel NH82801HBM SLA5Q Chipset
1 x FireWire 1394 Port
1 x FireWire 800 Port
1 x RJ-45 (LAN) Port
1 x Mini DVI Port
3 x USB Port