When i Booted from cd with internal HDD only, Disk utility does not recognized and could not see internal hdd. restart with opt key down does same result-can see or cd only,or with out cd only blank gray screen with cursor on it.I am booting from internal hdd. Jumpers -not sure that i know how to use jumpers,or simply do not know about it.Do you know how to use it?( just macking sure that hdd board connector is clean ,i cleaned it up from any corrosion an films,and let it stay for 24 hours to dry up by air...let you know next day,Thanks