Apple Mac Pro 2.8 Quad Core.

Used in the office for a couple of years and it stopped working. Tried to put in a new gfx card and it didn't fix the problem. It still turns on but won't load.

Specs from Mac website:

he Mac Pro "Quad Core" 2.8 (Early 2008) is powered by one 2.8 GHz Quad Core 45-nm Intel Xeon E5462 (Harpertown/Penryn) processor with 12 MB of level 2 cache (each pair of cores shares 6 MB), a 128-bit SSE4 SIMD vector engine, and a 1.6 GHz 64-bit independent frontside bus.

By default, it was configured with 2 GB of 800 MHz DDR2 EEC "fully-buffered" FB-DIMM memory, a 320 GB (7200 RPM, 8 MB cache) 3Gb/s Serial ATA hard drive, a double-layer 16X "SuperDrive", and an ATI Radeon HD 2600 XT graphics processor with 256 MB of GDDR3 memory and two dual-link DVI ports.

Expansion includes two external 5.25" "optical" bays (one free by default), four internal 3.5" "cable-free, direct attach" hard drive bays (three free by default), two PCIe x4 slots, and two PCIe 2.0 x16 slots (one free with one graphics card installed). Ports include dual Gigabit Ethernet, five USB 2.0 ports, two Firewire "400" ports, two Firewire "800" ports, and optical digital audio in/out, among others. Bluetooth 2.0+EDR is standard, AirPort Extreme (802.11g/n) and a modem are optional.

Compared to the original Mac Pro that it replaced, the "Early 2008" Mac Pro uses a more advanced architecture with faster and more efficient processors with larger level 2 caches, a more advanced vector engine, faster frontside buses (1.6 GHz instead of 1.33 GHz), faster memory (800 MHz instead of 667 MHz), support for optional faster Serial Attached SCSI drives (with the installation of the Mac Pro RAID card), and two 16-lane PCIe 2.0 slots.