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I suddenly got a 'Check Signal Cable' after turning on my monitor. It was working this morning I checked the vga cable. Inserted it to another monitor and it worked I have a

Samsung S19A300B Radeon HD 4670 asus mobo and a pentium dual core e5300

i tried using other cables but it just displays "check signal cable" and 3 boxes with red green blue colors and a "Digital" just below it :|

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It sounds like it's trying to use the DVI input for your computer instead of the analog VGA input that you want it to use. Some monitors try to autodetect this, while others you have to manually set. Is there a button on the monitor to switch inputs? You may also have to go into the monitor's menu to do this. I tried to find the manual for your monitor, but the product page on Samsung's website appears to have been taken down.

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actually the monitor has 2 inputs one for the dvi and one for avg .same for my vcard – kapitanluffy May 5 '11 at 2:22
Right - What I meant was the monitor is looking for input on the DVI connector instead of the VGA connector. – Dan Walker May 5 '11 at 3:40
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