Imac 2011 27inch chimes black screen keyboard is responsive

Hi
When I turn the mac on the screen just stays powered down. The system chimes as normal and if I press keys on the keyboard I can hear that input is being received (the adjust volume beeps etc all normal). The mouse also appears to connect but as no pointer on the screen no way to test this.
No new software or hardware changes.
Any ideas as to the cause or possible resolution.
Not sure of the operating system. I recently inherited the machine from a relative so not sure what OS he was on.

Hold a flashlight at an angle up to the screen. If you can see something on the screen, then it sounds like a bad backlight inverter, a bad backlight, a loose or burnt backlight cable. You might check with your friend, to see if he or someone else recently worked on it. If the backlight cable just came loose, then it is an easy fix. If it is one of the other problems that I mentioned, the it will most likely cost more than the computer is worth to repair.
Additionally most iMac's (depending on the model year) came with either a DVI, Mini DVI or MiniDisplay Port, that you can connect an external monitor to. It won't fix the existing problem, but it might make the iMac usable for a time without dumping money into it for repairs.

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Message was edited by: mindsoul

Not running Leopard (Panther), but I have a similar problem on my 24" iMac. Computer was working fine last night (I shut it down) and when I went to boot up this morning the computer is stuck on a black screen.
The boot up sound is initiated but nothing after that. The power light stays at full brightness, if I touch the power button the light blinks and then after a while it goes out. A full reset does nothing. I've tried reseting my PRAM, which works because I hear the start up sound twice, but no change to the black screen.
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Heres a snap of the screen
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http://www.ernieflores.net/osx-page-3/always-boot-mac-os-x-in-verbose-mode/
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B&W G3 Powers On No Chime Black Screen

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The whole story sounds very strange to me I never heard about that fact that changing the boot mode from UEFI to CSM would affect the BIOS.
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Imac starts with a black screen and flashing white light on console

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http://support.apple.com/kb/HT1432
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Imac 2011 27inch chimes black screen keyboard is responsive

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