Either way, a good first step for debugging any board is to carefully go over the whole board, possibly with a magnifying glass and in good light. Look for any solder bridges, bad joints, and anything else that might make you wonder...is that right??? While you are doing that you could also make sure that any cuts have been done cleanly and are in the right place. It can also be worth running a sharp implement of some sort between each of the tracks just to make sure there are no shorts between tracks, craft knives, dental probes and quite a few other similar things have been used with great success, and afterwards give the board a good brush down to remove any debris, a cheap unused toothbrush works well for me, and as with anything pointy or sharp, please do take care
On the componenet side of the board very carefully check that all of the componenets are there, in the right place, right values, and correct orientation (they are such simple errors and ones that probably all of us have done at some time or other) And if all that hasn't brought things miraculously to life then you'll probably need to spend a bit of time with the multimeter to see if you have a faulty component or few.
If you are able to take a nice large high resolution photo of each side of the board? It is always a welcome help for others to spot anything obvious as well.