I gave my friend my old Dell Dimension dekstop with P3 1.6 Ghz processor to replace his horrible Celeron. He put in his own harddrive, memory, cd drives, etc. The problem is there is a conflict with some of the parts. We can't figure out which parts. All of them worked fine when we tested them in other computers. There is a little yellow light that likes to blink on the motherboard. We found out the memory was faulty, we replaced it, but it still won't boot. Any info on part conflicts or suggestions would be helpful. thanks.