Monitor Acting Strangely

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i would also take a look at the graphics card first.

is there any color distortion when it flickers?
if so is it pixelated or smooth?
if its pixelated it is almost sure to be the graphics card
if its smooth its usually the screen itself.

have you tried feeling how hot your graphics card gets?
gaming and some web use both use the graphics card so depending on the card it might be an issue.

Alternatively you could just take a simple and non-technical short cut.

Most monitors will display something to the effect of "no video signal" if powered on with no video source attached - so disconnect the video cable and power it on.
Alternatively, assuming there's no "no video signal" message available on this monitor - there's normally a button or combination of buttons to press to get to the monitor's setup screen (colour balance, set vertical/horizontal position etc.)
The manual should give information on either of these but as some "no video signal" displays are rather brief, aiming for the monitor's setup menu is the best bet.

The point being that with either of these, the monitor will use its own means of displaying a picture and doesn't require any sort of video input to do it, so it's an easy method of resolving the basic "machine or monitor?" problem.

If these fail to display anything sensible then the monitor itself has failed.

The flicker is much less now. Meaning, that it isn't nearly constant like before. So I will be putting off buying a new monitor for now. Thanks to everyone for the feedback!