"No Signal" message when conneting an external LCD through VGA connection

Hi,
I have Lenovo 3000 N100 (TYPE 0768-FPG) , OS - Windows 7.
It is connected to an external LCD (SONY LCD) and everything was OK untill one day, without me changing anything, suddenly I get "No Signal" message on the LCD when in PC mode. I tried different VGA cabels and different LCD monitor, tried formatting my machine but nothing helped.
Is there anything else I can try?

Actually, the message I get on the LCD  is: "No sync".
Anyone...?

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