Acer aspire 5315 case study :

[windsor]

harddisk detection problem. no rotation also. check sata hdd conector for supply 5v and 3.3v ok. now check caps for communication between ich (hbm) and connector ok. sata pll (phase locked loop) 1.5 v ok. sata rbios with ground ok. sata gpio pull up 3.3v ok. sata clock resistance ok. change sata data transfer caps and receive caps. no detection. no rotation. everything looks ok. now change hbm. hdd no detection no rotation. slient ,now check dvd writer detection that is ide detection ok. check usb for boot, not work. check usb keyboard not work. situation change usb also not working. now check usb supply, impedance for data, usb pll supply, usb rbois, oc supply, clock resistance, no change. finaly i change clock Crystal after change hdd start rotation but no detection, no usb now i change clock ic hdd detection and usb working ok. laptop boots windows. laptop working fine.