This sounds like an RCD has tripped,
You should follow an RCD reset procedure to try and narrow down where the issue may be, caution this is a temporary solution to get some power reinstated safely so that you can be back up and running whilst you wait for a qualified electrician to come and take a look.
RCD Reset Procedure as follows.
What is an RCD?
A Residual Current Device is a safety device which is now, fortunately, pretty common in most domestic electrical supplies.
If you’re not sure whether you have one, it should look something like this:
There will usually be a small reset button on it, sometimes red or yellow.
It will either have RCD, RCCB or RCBO written on it.
How do I reset an RCD?
RCDs are designed to be reset. Sometimes they trip for no apparent reason. They can be tripped by a lightbulb blowing. It isn’t always an indication of a problem.
If the lever on an RCD is in the DOWN position, it is off. To reset it, the lever simply needs to be pushed back UP. For some RCDs, it is necessary to push the lever fully downwards before it will let you push it back UP and reset.
In many cases, this will be fine. The RCD will reset and all will be well. However, if there is a fault on your system somewhere, the RCD may not reset, or may reset temporarily, only to trip again a few seconds/minutes/hours later. If this happens, then you may well have a problem which needs to be addressed. The RCD is telling you that something is not right and you need to investigate.
To work out whether this is something which you can resolve yourself, or whether you need to call in an electrician, there is a simple procedure to follow.
My RCD won’t reset. What should I do?
If you were in the house when the RCD tripped, ask yourself what happened just before the RCD tripped. If you had just turned the Kettle on, or switched on the Iron, there’s a possibility that this may be the cause of the problem. Fully unplug the Kettle/Iron and reset the RCD. If the RCD resets and stays reset, then you have probably found your culprit.
If you just drilled through a wall and the RCD tripped, there may be a strong link between the two events. It is quite possible that you may have drilled through, or otherwise damaged a cable. If you didn’t check the positions of cables prior to drilling, you have just learnt a useful, but possibly quite expensive lesson. Its time to call in an electrician to repair the damaged cable as soon as possible. It is quite likely that the RCD will not reset until the damage has been repaired.