Light Pipe, Power Mac 7100, Quadra Centris 650 $10.00 Power on Light Pipe, Power Mac 7100, Quadra Centris 650 quantity Add to cart Add to Quote Continue Shopping Category: Case & Internal Parts (Macintosh) Tag: power light Description Apple 815-6252. Light Pipe indicates power on and resides on the Logic Board and extends through a hole in the case. Power Mac 7100, Quadra and Centris 650.