Will Apple Genius Bar work on my iphone after I opened the housing?

I have an iphone 5 which needed a battery replacement. I bought a new battery and tried to replace it myself but failed at it.

it does not turn on and when I connect it to my macbook via USC connector, it vibrates constantly.
There seems to be a problem with the screen as itunes work when the phone is connected to my macbook.

I'm planning on bringing my phone to the Apple store and have the genius bar guy take a look at it. My warranty already ran out so I'm planning on paying for the service.

Will genius bar guys attempt to repair my phone? I know that once you open the housing the warranty gets voided… Someone also told me that genius bar guys do not even attempt to repair it if the phone has been already opened… Is this true?

Please let me know!

Yeah they will still work on it but you might have voided any warranty if you had one.

Not for free, not anymore.