MacBook Pro won't boot up - Chime heard/black screen/unresponsive

Any ideas guys?

MacBook Pro Retina 13" (Late 2013)

Model A1502

C02LJ7G9FH01

500gb SSD

Bought Nov 5th 2013 from Apple Store Sydney Australia

Live in Uk

Not under Apple care warranty

Crash occurred 4th Jan2016 approx 12:30

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When transferring video files to external hard drive and virus scan running;

Mac book became unresponsive to any actions for a few hours except jittery cursor movements every ten minutes

After leaving Mac for an hour and no actions available I decided to hold down the power putting to force shut down.

After it came back on the screen was black. When left for half an hour a folder and question mark sign came up flashing. Being unable to take action I force shutdown the MacBook.

Since then :

Upon turning on Display turns on but it is a plain Black screen - no image visible even under flashlight.

Startup chime is heard

Apple logo is illuminated on laptop cover

Caps lock button does not light up

Display adjust buttons have no effect

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Tried to start In safe mode and disk utility mode but command did not work

OR

Did work and display is not functioning

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PRAM? reset successfully (two chimes heard) but no boot up following this

SMC reset successfully - power indicator on lead turned green momentarily.

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Phoned Apple, they reckon it is a hardware issue from over the phone troubleshooting

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Update also plugged in two bootable USB devices and an external screen. But no success. Also won't allow target disk mode

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Booked Genius Bar appointment to see if they can diagnose the fault.

Any ideas guys?

Thanks in advance!

J