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Both of these situations suggest that there is a problem with the monitor, the video card inside the computer, or the cable connecting them.
Begin by inspecting the cable for damage and make sure that it is connected properly. If you have recently unplugged and replugged the monitor, check that the pins on the cable which supplies the signal (not the power cable!) are not bent or damaged. If they are bent it may be possible to correct this with some taper nosed pliers.
It here is no visible damage, the next advice is to hitch your monitor up to a spare computer, or a spare monitor to your computer (if you can borrow either). This should identify whether the problem resides with the monitor or with the video card in your computer. Then seek advice on repairing or replacing the faulty item.
Should your monitor need servicing, that may prove expensive. The good news is that unless you need high quality; it is possible to buy a reasonably decent 2nd hand one quite cheaply.
On the other hand if the problem lies with the video card inside the system box AND you are confident with your own abilities, it might be worth trying the following:
Just remove the video card, holding it by the edges only. Blow the dust off it, clean the edge contacts with paper towel or similar, and replace it making sure that it is re-seated properly. {At least it saves a call-out fee!}
Remember the secret of successful fault finding is to eliminate likely faults one by one!
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