I recently as a test, i changed my old cpu's core to core 2 quad q6600 from core 2 duo e8400. It is a Optiplex 960 sff. After cleaning the fan i use thermal paste and put the cpu in but i cleaned the slots with tissue paper some tissue was left inside. i tried to get it to show display but it didn't. It showed an Amber light and 0 display. I tried to make the Keyboard run but it didn't show any lights either. I cleaned the ram, replugged in the GPu. It still gave me the same error. I even tried jumper but it still didn't work i don't really know where the jumper is but i tried that blue slot thing on everything that looked like jumper it didn't work. Please help me. It shows 234 on the CPu. I tried to reinstall bios but i don't know how to since it shows no display