The first step is to make sure the plug you have the power cord plugged into is supplying power to the monitor. [surge protector? Check the switch or the reset button]. Check for the powered on light, usually in the power on button on many computer monitors. Yellow usually means a bad connection with the computer. So the monitor is actually on, it just appears off because you have a black screen. Check the video cable linkage to the back of the monitor and the computer's graphics card or digital video out.
If when you "power on" the monitor's on light does not light it means that power is not getting to the unit and you could have a bad power cord. If it is of the universal type that unplugs from the unit you can swap out for a new cord to test this [some monitors have external power supplies as part of the cord and this could be the problem]. If swapping it for another works than that was your problem.
Many monitors though have their power cords mounted via chassis clamps to the unit and have internal power supplies and are not end user serviceable.
If power is making it to the unit there are a handful of possibilities. Unfortunately the majority of them, at that point, involve dis-assembly of the unit's outer casing and is not advisable to an untrained end user. A service call would be required at that point.
Clarification added to the above:
The type of cord with a power supply inline is NOT universal. The new one you swap out for the other will likely have to be provided by the maker of the unit. [in this case, MAG]
Sometimes a retail supplier will, if you bring the unit back to them, open another unit to use its power supply to test the unit in the store. If it resolves the problem they might supply you with that one and RMA the broken one back to the maker for replacement.
Depends on the quality of the retailer and how long ago your purchased it, along with their in store policy on such things.
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