Apple imac 17in 1ghz Servicehandbuch

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iMac (17-inch Flat Panel, 1GHz) Troubleshooting - 9
 General Information
4.
Connect the power cord and power up the system again. 
Warning:
 Whenever the bottom housing is opened for service, you must do two things:
1. You must clean and reapply thermal paste to the thermal pipe surface.
2. You must tighten the four torx bolts on the base unit to a minimum of 17 in.– lbs. Failure to follow 
either of these steps could cause the computer to overheat nd damage internal components. 
Refer to the next topic, “Thermal Paste Application” for detailed information.