I turned on my computer but it doesn't show anything on the screen

I turn on my iMac, I hear it running, but the screen doesn't show anything and it also doesn't make the 2 beeps it usually makes when I press the power button. There is also slight ringing when it is off and still connected to a power source.
I've tried disconnecting the power cord for 30 seconds, plugging it back and waiting a few more seconds and turn it on.
Here are the things it has:
2.5GHz quad-core Intel core i5 processor
4GB of 1333MHz DDR3 SDRAM
500 GB 7200-rpm hard drive
AMD Radeon HD 6750M graphics processor with 512 MB of GDDR5 memory
Thunderbolt port
I have not updated to Mavericks or Mountain Lion OS X
The Model No. Is A1311

Hello Salavaur,
Thank you for contacting Apple Support Communities.
You can use the following article to troubleshoot the video issues on your iMac:
Apple computers: Troubleshooting issues with video on internal or external displays
Regards,
Jeff D.

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I turned on my computer but it doesn't show anything on the screen

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