My computer turns on but is black

When I go to turn my computer on the power button comes on but the screen is black

Hi
Try as follows
Disconnect all power cords
Held down the power to turn off the system
let it sit for 5 min
Restart the computer holding down the shift key
It will login in the safe mode if everything is ok restart normal way
Attached bellow reference which will help
http://support.apple.com/kb/ht1379
http://support.apple.com/kb/HT3964
Regards
Meenakshi

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Please read this whole message before doing anything.
If the machine is a MacBook and you get a black screen without a cursor, you might be able to log in by closing the lid for about a minute, then opening it.
If the login screen doesn't respond to clicks, make sure you're physically clicking rather than tapping a trackpad or Magic Mouse to click. Also try to make sure that there is not a wireless input device nearby that may be stuck in the mouse-down state.
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Start up in single-user mode by holding down the key combination command-S at the startup chime. If you’re using an external USB keyboard, it must be plugged directly into a built-in port on the Mac, not into a hub. Release the keys when you see a black screen with scrolling white text. In this mode, there’s no graphical interface; just a command line. Initially, you can’t make any changes to files.
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When requesting help you should always include the make/model (i.e. p6-xxxx) of the computer and/or monitor. This information is necessary for us to review the specifications of them.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
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