Smart TV keeps going into Standby Mode

Hi there,

I've bought LED Smart (BUSH) from local electronics shop in UK which buy lots from Argos UK and friend of mine courier it to me in Dublin two weeks ago.

It worked fine for first two weeks when I explored its all smart features and was happy about it but my Tv went into standby mode yesterday morning when standby red light keeps flashing while TV screen keeps going into black with blinking of red light 25 times and then slight whitish and never came out of that since than.

I've googled and found one solution to reset the standby / power mode by pressing power button for 30 seconds, turned it off from power socket by keep pressed power button (30 seconds) and keep pressed for another 30 seconds while tv is turned on. This thing didn't work which I tried couple of times.

I tried to attach my laptop through HDMI cable which at some point shows me it is connected but tv screen remained same black & then little white in a loop.

Would you know if I can try anything else so it can start working again before I post it back to UK which is bit hassle as company wouldn't bear courier charges which is around £ 50/- return which is bit expensive as the tv price was just £ 165 when I bought it?

Thanks in advance.

P.S: Please suggest/share which courier company is cheapest that can send courier from Dublin to UK?