My Studio 1735 does not boot

Good day everybody.

I was hoping somebody could give me their opinion on a problem I am having with my laptop Studio 1735.

Two days ago I turned it off to go to bed like usual and yesterday morning when I tried to open it again it did not boot.

I removed the battery and all that in case it was just something simple like that but still it does not boot. The battery if fully charged, the power button turns on, nothing shows up on the screen, it stays blank, and the hard drive light stays on for only 3 or 4 seconds. Then the computer stays dead. Only the power button stays on

I have a feeling that it might be the power supply but I am no expert.

Any input would be appreciated.

Like what would you do to have it fixed  and if younthink you know the solution how much do you think it would cost and where would you go. My Dell warraty is over since September.

Thanks all.