Answer:
CPU Fan and Heatsink. Cleaning a RAM slot.
Optional Items:
A dust mask - from your local hardware store.
A Static Strap - from your computer store or possibly supermarket.
One 3volt Battery type CR2032 or equivalent.
Assorted coloured stickers.
A CDROM Lens cleaning disk - available at computer stores or supermarkets.
Step-by-step explanation:
hope this will help you