I need to find a computer for my Mom. She is very simple: plays jigsaw, Mahjongg.. Does not even have internet. She had Pentium 4 1.8 recently but MB is bad so would like to get her one that is new...ish, Refurbish because you can find lower end (not gaming type) systems at a good price. She defiantly wants a Small form factor type to put on her desk. These are the ones I have come down to and I want you opinion because I have heard some have overheating, power supply.......Problems. I could get her faster Pentium 4 but I can get a Core 2 Duo for about the same price. What are your thoughts on listed below? HP Compaq dc7700 Core 2 Duo E6300 1.86GHz 2GB 80GB CD-RW/DVD Windows 7 Home Premium Ultra-slim Desktop Model#: DC7700U-C2D186-MAR-2R - $139.99 HP Compaq dc7700 Small Form Factor - Intel Core 2 Duo 2.1GHz, 1GB DDR2, 80GB HDD, Combo, Windows 7 Home Premium Model#: RB-DC7700C2D - $159.99 Dell OptiPlex 755 Core 2 Duo E6550 2.33GHz 2GB 80GB CD-RW/DVD Vista Business Small Form Factor Model: OptiPlex 755 SFF - $149.99 Thanks, Debbie