Macbook black screen, white light, no chime and more problems

When I completely shut down my Macbook (regular starting 2009) and turn it back on I see the white light only and black screen. Nothing works! this has happened two times and I pressed the power button for 10 seconds to do a PMC reset and it actually turned on and past this week I've been pressing SHIFT+PWR button to turn on my Macbook.
Also, when my macbook wakes up from sleep it takes a while to get back up and sometimes the sound dosen't work although I see the devices in the Audio MIDI.
Does this mean my logic board is going bad or is it a NVRAM problem? I tried resetting the NVRAM but it didn't work!

Have you tried running the Apple hardware test?  Run the extended test, which can take over an hour.

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