Dell Studio laptop will not turn on

I have a Dell Studio 1536 laptop. Almost 2 years old. It has always worked perfectly fine. I was using it earlier then put it in sleep mode. i came back 30 minutes later and tried to turn it on but it won't start. the power light turns on but the screen remains black as if there is no power. i also can't hear the harddrive whirring or booting up. I tried the trick where you reset the laptop and put power back in, but that won't work. I then went inside the laptop, reseated the memory and harddrive, but no luck still. same problem persists.

any help would be really really really appreciated. i am a college student and need my laptop badly.

Thanks in advance