No boot disk found

I'm using a Mac mini,
OSX mountain lion or mavericks ( not sure if it's been updated)
Using apple wireless keyboard and mouse
Backup end up to external HDD using Time Machine
I recently purchased a seagate wireless plus 1TB hard drive. During its setup I needed to reveal some hidden files in its media library, so I research how to do it on google and used 'Terminal' to display hidden files in finder. I used the command -
"defaults write com.apple.finder AppleShowAllFiles TRUE"
After doing this I restarted my Mac mini in the normal way. I did not use the KillFinder command.
The computer powered up
Gave a power up tone
Displayed a blank grey screen for around 30-40 seconds
Displayed a black screen with the message " error loading operating system "
I powered down the computer by holding the power button, removed USB peripherals including HDD used as 'Time Machine' backup then restarted to be greater with-
A power up tone
A blank grey screen for 30-40 seconds
The a black screen with a message " no operating system found -- insert boot disk and press any key"
After a online chat and phone call from apple i'm no further on. I've been told that I need to go to an apple store or an authorised repairer.
I tried starting up holding the option key,
"""" the shift key
"""" the Command + R
With no joy
Can anybody advise ??

During its setup I needed to reveal some hidden files in its media library
What hidden files? What media library?

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       0:      GUID_partition_scheme                        *1.0 TB     disk1
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    /dev/disk2
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:                  Apple_HFS Fusion HD              *1.2 TB     disk2

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