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HELP! Monitor has no Signal

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I'd like some advice from someone who might have more of a clue than me!
My computer randomly just loses signal to the monitor and so I have to restart it. This is totally intermittant and doesnt seem to have any pattern. usually a restart seems to resolve it temporarily but now it just isnt coming on at all apart from the no signal msg or at best i can watch it boot up then it goes off again.

Dont know if some background is helpful but I'll give it anyway. About a year ago my computer blew up! I got a new higher capacity PSU, a new motherboard and eventually a new graphics card. To start with the computer worked fine then I started getting the random 'no signal' on the monitor whilst in the middle of doing things. After much frustration and fiddling about removing/replacing the graphics card etc it seemed to solve the problem ( I think it was a fluke!) for about 11 months it worked perfect... now the same problem has started happening again!

Any suggestions as to things I can try? Not too technical please!! or an idiots guide!! :whistling:

The monitor is fine I have tested it on another PC.
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    motto - Just get-er-done

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It can really only be 2 things now that could cause this. Either the graphics card is quitting or the cable to the monitor has a dodgy connection somewhere. You might check to see if the power supply is getting enough power to the graphics card. Some graphics cards need need specific wattage to run like 75 watts or so. This means you usually have to have a line capable of at least 7 amps to run. If more than one piece of hardware is connected to a line it may be pulling more than the line is rated for. It also may be the power supply does not have enought rated voltage to keep u[p with the system so the 12 volt line goes low and the graphics card quits. Download speedfan and see what it says for your voltages.

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