Hi, 

Do you mean the power led does not come on? Ensure that you use the original power adapter; meanwhile, you can change another one with same spec.

Besides, try to hard reset it by holding the reset button for 10s. 

If still the same, you may need contact their tech support to check the warranty service. 

Teratron wrote

When I connect the power supply adapter, the green light(indicator) doesn't show up, tell me what to do?   I dont get WiFi connection!!

Is there any easy way to fix it by opening it and adjusting the internal connection ? (I Exactly dont know what the problem is, I think it might

be because of an internal loose connection.)     I got Warranty for it, So Can I go for it?

@Teratron tp link mr200 power problem 

@Teratron  tp link mr 200 version 5.0 power problem