I have a dell dimension 3100 posting with diagnostic liaghts I certainly have no clue why i am recieving these lights on the unit. It powers up an seems to be working fine, i just finished doing a reinstall of the of XP to SP3 with no problems. I am getting a Green 1 and 2+4 are amber anyone have any idea what that means? or is the system is operating fine? I believe all the lights should be off if everything is happy? I will appreciate any help with this thanks.