HT6154 My iPhone 4g wi fi is greyed out. I've backed it up to my computer after having a lengthy discussion with an Apple tech person at the apple store. What should I do next?

My iPhone 4g cannot connect to wi fi. It is greyed out. I've spent the day at Apple, backing up my iPhone to my computer, resetting network, and rebooting everything many times. What is the next best step? The Apple tech at the store said that my phone no longer has a warranty and I should either get another 4G or go to a 5c. I've seen that iPhones generally have a greyed out problem and that it's not software, but a hardware issue. Help!

Lmwilliamson wrote:
Kernel panics:
After taking my late 2009 15 inch macbook pro to the apple store, the genius completely erased my computer and reinstalled the Mac OS X software, but the problem still persists. 
I also took it to my college tech support center, they tried to take the ram out and reinsert it and clean up the dust, but the problem still remains.
I am able to use my computer in Safeboot mode (only)
Well it could still be a software problem if you installed a third party program after the OS X wipe and install, because by booting into Safe Mode it disables certain functions of OS X and hardware. Check for updates or problems for all your third party software, include everything, including menulets, System Preference panes, hacks and so forth.
If you restored any sort of software from backup like TimeMachine, it likely was corrupted data and now is returned.
If the college tech support found a lot of dust clogging the rear exhaust vents behind the fans, then likely the heat damage done to the machine has already occured and can't be reversed. Video cards are usually first to go, which Safe Mode does disable the video card somewhat.
Run through this list of fixes, it's systematic in nature, also has a Hardware Test to see what's going on
..Step by Step to fix your Mac
Too bad this is occurring to a mere 4 year old machine, but dust will do that. Here is the culprit that Apple doesn't tell anyone about.

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