IMAC does not boot, only beeps. Video attached

Hello:
I am trying to figure out why an iMAC does not boot properly.
Memory:1GB (only 1 module in one of the 2 available slots).
Everytime I push the power button I only hear a sound and that's it.
You can hear the HDD spinning but the screen is always black.
Please find the sound that the iMAC makes everytime I turn it on:
http://www.youtube.com/watch?v=duRTB3iDZEU
Keboard does not respond so I cannot use things like press a key when turning on the computer, etc.
Mouse light is ok.
I am a newbie with MAC's so excuse me if I'm not doing something right.
Thanks

Hello robertin75
Check the ram, if the module has gone bad, has become dislodged or not fully seated in the slot then the iMac will only beep indicating an error and will not startup.
http://support.apple.com/kb/HT2341
I'm not exactly sure which model iMac you have and so it's hard to give specific instructions, but if you check in the User's Guide that came with it you will find the instructions for replacing and installing ram in your model.
If you no longer have the User's Guide you can find out by using the the following link.
http://support.apple.com/kb/HT1463
or the next one if it happens to be a newer glossy screen aluminum model.
http://support.apple.com/kb/HT1758
Dennis

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