Few reasons for no display
1. Are you connecting it on HDMI? If yes, sometimes it happens that HDMI settings needs to be checked.
Go back to audio, video cable (the red and the yellow connector). Keep the power button pressed for few secs, you'll hear a beep, which means setting is changed to default and display has changed to audio/video. If this happens, you need to change your HDMI settings in the xmb menu.
2. If the above doesn't work that means system is kaput.
Go to palika bazaar (Connaught place) - metro station gate no. 6. You may find some one there who can help you (first check the upper level shops instead of lower levels- usually upper levels there are fixers and lower levels are shop owners)
But beware, dont handover your system just like that to them. Whatever you want to get fixed, have it fixed in front of you. If ask you to wait and they will come back to you post getting it fixed, dont believe them.
3. Sony authorised center in case you want to shell out money
4. Sell it bro, days of ps3 are over. Save money buy ps4
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