Default Nexus 5 display completely gone

Hi ,

I bought nexus 5 from USA and start using it in India, so when i start downloading apps etc from play store it worked for some time, and suddenly display is completely gone, cant see any thing at all. however when i connect the device to computer, it detects it and shows the contents etc. when connected to PC, android device manager detected it and I erased all teh content from there assuming that it might reset it to factory settings and if that may help, but nothing, Not sure if its a hardware issue or software, issue when i tried Ring option from android device manager it rings with sound but no display at all, any idea how do i go about it, its been just one day since i start using it in India, and since i bought it from USA there is no warranty support here in India.
Thanks
Dhananjay