I got a 2009 27 in i7 quad core upgraded memory 16gb  came installed with osx 10.8.4, but i think its been hacked or something cus now cant reboot to login...didnt have chance to backup all my music files created...tried use disk utility nohelp. help me

pleaswe help me im a newbie with apple ...spent 1800 on this refurbished through www.gainsaver.com but when i upgraded and installexd memory using apple tutorial i ended up voiding extended 3 yr warranty ....not happy please help me fix this if i lose all my music files i madeplus older musix files for upcoming itunes release im doomed .....not alot of money for repairs i put everything into this when i bought it 5 months ago.....im novice so clear steps and procedures to try and save me and my computer wil be greatly appreciated;;;alsl didnt ship with disks when initially recieved from shipping thx

You've been given some misinformation.
RAM is the only thing in an iMac that IS user upgradeable/installable.
You cannot void the extended AppleCare installing your own RAM modules.
So, whoever told you this, has lied to you.
If you actually opened the iMac's face and attempted to do some other internal work, then yes, you would've voided the 3-year warranty.
But, opening the RAM access area and upgrading the RAM does NOT void the AppleCare warranty.
What type or manufacture of RAM was it?
Macs a very picky about the RAM that they need to use.
Here is the correct RAM specs for your model iMac.
Maximum Memory
16 GB
Memory Slots
4 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM
Correct and reliable Mac RAM can be purchased from online Mac RAM sources Crucial memory or OWC (macsales.com).
Plus, whoever installed OS X 10.8 Mountain LIon on to this 2009 iMac should've done so.
OS X 10.8 is a download only OS and is forever tied to some other Apple ID other than your own Apple ID.
I do not use OS X 10.8 Mountain Lion, but there should be a recovery partition that you can use to try and reinstall OS X 10.8 Mountain Lion.
Hopefully, someone with more experience with OS X 10.8 will be able to better help you.
If you need a set of OS X restore discs, then order OS X  10.6.3 Snow Leopard from Apple here.
It is only $20 U.S.D.
http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
Good Luck!

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