How do I start up my computer when the screen is black after "waking" it up from sleep mode and/or turning it on from the shut down?

I really need help! I just got this MacBook Air almost two weeks ago. It is a refirbished one. Now lately, when I put it to sleep and then get back to it, it won't wake up. It just gives me a black screen and a running noise. Sometimes it does it too when I shut it down. And sometimes it will work fine as if it never happens-i move the mouse and the computer starts up. I am deaf and living on campus for school, so there is no chance for me to get some help through a simple phone call and there is no nearby apple stores or providers.
Please help me, I do not want to go back to my Dell computer.
Ronni.

I'm not certain but my new MBA 13...when in sleep mode comes back on from a black screen when I simply click on the left mouse button. Also, one time I did a SECURE EMPTY TRASH on files that totalled more than 1GB and it took so long that the fan kept increasing in speed so I pressed on the POWER button and the MBA shut...I was able to boot up with no problem. As a rule, I now only do secured erases for trash bin data totalling 500mb or less...anything above that gets a regular erase (dump).

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