I was given a box full of broken laptops to play with. Included was a Dell Latitude D620. 1.6Ghz Intel core Duo, 2gb DDR2. Hard drive was bad (which I replaced), and I'm not quite sure why (this was 6 months ago) but I opted to replace mobo as well. Ordered a new one, sealed in the box. After install, keyboard doesn't work, (don't remember if it did before or not) and when using USB keyboard, the directional arrows are extremely touchy! Also, as soon as it's plugged in, it powers on, without pressing the power button. I ordered yet another new, sealed in box motherboard, and the same issues came about. Not the motherboard, I'm guessing. Ran thorough tests on RAM with Memtest, everything checked out okay. Tested CPU with QuickTech 5.9. What's going on here? How can I remedy this issue?