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I tried to install Ubuntu 11.10 from a Live CD and from a USB pendrive, but when I choose try Ubuntu or install Ubuntu from the boot screen, all I get is this message: "out of frequency range" and the monitor turns off in few seconds. I use an nVidea GeForce FX 5200 graphic card.

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Check your keyboard as well, it looks like your caps lock is blocked. – Marc-André Appel Feb 3 '12 at 9:21

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Have you tried booting it in "Safe mode"? I can't remember if the LiveCD has that option or not. If that doesn't work you may want to try to download and install from the "Alternative Install" Ubuntu disc.

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I can't find the safe mode too. Can you give me more information about alternative install disk? thanks anyway. – Sofiane Bouamine Feb 3 '12 at 10:27
On this page there is a link for the bittorrent from Ubuntu to download the alternate install disk as well as other bittorrent downloads for other Ubuntu versions. – Shogun Feb 3 '12 at 10:33

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