IMac G5 wont recognize previously recognized display. Need Help.

I've had an LCD display connected from DVI to HDMI and has worked fine as an extended desktop for months. Now after a restart, it won't recognize the display. It is connected the same way it was before, I've tried reconnecting, restarting still wont work.
Anyone have any ideas?
Thanks

Assuming you've checked all the connections to make sure everything looks ok and is tight, go to system preferences>display and select the option detect displays. If that doesn't work, I'd try testing the monitor, cable, and adapter using a different source.

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IMac G5 wont recognize previously recognized display. Need Help.

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