HT4904 booting frizzed after apple logo

   command R does not work to boot my system? what can i do? but also the cloud sign do not appear , so what is the problem?
In addition, i took out the hardware ,RAM and also keyboard , but nothing did not happend.Moreover the safemode also could not help us.

Are there any external Devices connected?
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214

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