IBook do not want to switch on

Hello guys!
Have a problem. In short:
- it does not want to switch on ocassionaly
- when press power on button just switching on fan and i produces lot of noise, i never heard from my laptop so much noise
- it was started to switch on only after coouple of bumps at the bottom of laptop.
I suspect maybe some loosen contacts inside. Myabe i am worng so correct me og give me a tip please.
Thanks god it is still working, so hope tomorrow i will have some nice answer from you.
Ivan
iBook G4 1GHz 12" Combo RAM 768MB   Mac OS X (10.4.8)  

Hi hwpienaar,
Welcome to the Apple Support Communities!
I know that it can be frustrating when issues, such as not being able to turn on Wi-Fi, arise. In this situation, please use the attached article as a reference to help you troubleshoot this situation. 
iOS: Wi-Fi settings grayed out or dim - Apple Support
Best regards,
Joe

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