Hi, I have a dell studio 1745 with a bad video. Replacement 1745 boards are in the $200.00 range. I found a few 1747 motherboards that are refurbished by Dell for a great price of $66.00 plus shipping
From what I have been able to track down, it seems the motherboard is almost exactly the same. The cases are the same, so a upgrade board is easy to install, the only differences seem to be that I need a new CPU and the CPU Cooling heat sink.
Looking for Cost on e-Bay it seems I can wind up with a I7 1747 for less money than simply buying a repaired motherboard.