hi all i just added another stick of memory and pc was ok working fine then it rebooted it wouldnt restart harddrive light was on but no sound from it ,and nothing on screen . i took memory out of , pc booted ok , tried again, runned for a while then same. rebooted with stick in but i got this on monitor a box saying imput not suported and it moved up screen this box it was weird . is it the memory whats dodgy or could it be somthing to do with clock speed its pc133 sdram micron make the rest in pc is generic thats always been ok