Have a Dell Inspiron XPS T500. Thought upgrading DDRAM would be easy enough. Found out that my A drive was not working. So I could not update the BIOS to handle the higher RAM. Swapped A drives from another computer and had same problem. Put original A drive in a different computer and it worked. So it is not the drive itself. Then I tried swapping cables. Same results. So it's not the cable. The Tech at Staples checked it out and said I needed a new Mother Board. Bought an "SE440BX" and replaced all parts. Other than the sound card being integrated with Motherboard, the only other change to the layout is that the cable from the front panel on/off switch to the Motherboard is different. My original cable is a 2 row connector. The new one appears to be a single row. How do I get the on/off switch cabled correctly to the Motherboard? Once I get this figured out, I'm sure I'll be asking for more support.