The screen can be replaced. you can find the part on ebay: http://www.ebay.com/itm/Touch-Screen-Digitizer-Glass-Replacement-For-HTC-Desire-X-Proto-T328e-Tools-/121056101391?pt=LH_DefaultDomain_0&hash... cheers
It should say the right pair combo on the computer's documentation. Otherwise this would be my winning combo: BAY1: 1GIG 1GIG 4GIG 4GIG BAY2: 1GIG 1GIG 4GIG 4GIG Mac Pro FB-DIMMs The Mac Pro Xeon machines use FB-DIMMs. They are installed in pairs. The machine has 2 riser cards that take the RAM, each card has 4 sockets. You populate the RAM in pairs, with the largest RAM in the numerically lowest slots -- in this order: A1 A2 B1 B2 A3 A4 B3 B4 The sockets 3 and 4 have a higher latency than sockets 1 and 2, so put your largest RAM in the 1 and 2 sockets. There is a small speed benefit to installing 4 identical modules across both risers: A1 A2 B1 B2 which permits 256-bit access mode. However, do not buy smaller RAM modules just to match an existing pair. There is a diagram on the inside of 2007 Mac Pros to help identify installation order. Newer Mac Pros have a diagram inside directing you to see the User Manual for installation instructions, instead. The 2008 Penryn MacPros deliver with RAM in A1 B1. This...