Bricked?

Hi
My wife and i use Galaxy s3 phones. Recently hers turned itself off in the night and wont turn on again. It was running a stock ROM unrooted. Battery is OK (tried on my phone). When I switch on I get the words Samsung Galaxy s3 but it goes no further. I can get into download mode but PC doesnt recognise the phone and wont boot to recovery using the 3 key press. In download mode I get an android picture and the word downloading... but unsure quite what it might be or not downloading. If I pug in to power I get a pic of a battery which shows no animation, colour and the bar is at zero. (I wondered if this was the problem I have seen documented of sudden unexplicable bricking of the S3)

I plan to leave it a few hours like this in download mode with poer cable on to see what happens now but maybe there is someone who can give advice even if its "buy a new phone".... The top L of the screen says
ODIN MODE
Product Name:
Custom Binary Download: no
Current Binary: Samsung official
System status:Custom

Thanks a million you clever folks
Simon

boomboomer said:

You have half SDS where the emmc chip is corrupt, nothing you can do yourself.

You should be able to obtain a warranty repair from Samsung, although your system status says the phone had been rooted at some point.

Sent from my GT-I9300 using Tapatalk

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Thanks for your quick reply. I understand from other posts that system status may falsely indicate the phone as having been rooted as a consequence of the half SDS, so have mailed the phone for repair. Do you have a view on whether the phone appears to be rooted with half SDS? I dont think I rooted it!
thanks
Simon