In the first pic the screws do seem silver coloured and in the second pic brass coloured. The cpu fan seems to be the intel LGA775 . Thats 775 pins and suggests it's an intel core 2 duo or above processor. The pins in the second pic suggest it's using the pins on the motherboard not pins on the processor system that intel recently brought out to cut back on returns on bent pins. The fact that the fan is designed for the board as can be shown by the screw holes in the right place says it's the right fan on the right board but he decided to use super long wood-screws when he lost the others .The amazing fact that a person who can install a cpu fan also didn't understand that driving screws through the motherboard would kill it staggers me .