You can certainly replace it yourself, preferably with an iFixit part, but if you're not comfortable with opening the device I'd take it to a reputable 3rd-party shop. Apple provides excellent service, but it's fairly expensive to get repairs there. It wouldn't hurt to take it to an Apple store and see how much they ask for in order to do a repair.
Is this phone compatible with your carrier? I'd first check with this page first: http://www.apple.com/iphone/LTE/#iphone-6-iphone-6-plus. You might want to remove the SIM tray and reinsert it, as well as restart your phone if you haven't. If you're still having issues, then you could try to restore your iPhone through iTunes on a computer.
Hi! I know this really sucks, but I may have a few solutions for you. First of all, I would recommend holding down the power button until you hear the fans stop, and you see the Mac boot up. If you can get your display to show anything, hold down the option key when you see the apple logo. This will allow you too see the different partitions on your Mac. You can either choose the OS X partition or try Windows again. If this doesn't work, you may need to open your Mac and reconnect the battery. Just follow iFixit's guide to removing the bottom cover, then dice next the battery cable. Wait about five seconds and plug it back in. Once you put everything back to together, you should get a better result. If none of this works, then try an Apple Store... Good luck!
I'm not an expert on the working of a MacBook, but it sounds like a connector may be broken on the battery, but it is more likely that maybe something on the logic board was damaged. If your Mac is still new, take it into the Apple Store and let a genius inspect the machine. My guess is that they'll ask you to replace the battery or notebook, but I don't know. Hope you can get your Mac working.
Hi! I know how bad it can be to have water damage on a MacBook. I am no expert, but I can give you some basic guidelines as to checking and repairing water damage. Assuming you have a pent alone screwdriver, you'll want to take off the bottom case of the MacBook. I recommend iFixit's guide for this. I would then use the visual test to check for water damage. Finding the damage is one thing, but repairing it is another. To get a better idea of what's wrong, was your Mac powered on when water was spilled on it? MacBook Pro 13" Retina Display Mid 2014 Lower Case Replacement
If you got a new Airport card and still are having issues, the connector on the motherboard may have been damaged. I would check the 'About the Mac' window and look at the system report to see if the system detects an airport card. If not, you could try an OS X restore. Otherwise, this issue is hard to fix...
This has happened to me too. The best thing to do is cycle the battery - 1. Disconnect the display data cable 2. Disconnect the battery connector 3. Reconnect the battery, then the display cable. After that, the display should be working better. You may have to do this a few times.