Try powering down everything. Then start with your modem, then your router, then your computer.
If problem persists, try plugging your computer directly to the modem. See if it works. If not, problem is with your modem and you should contact your carrier.
If it's working, try plugging the computer to the router. If it's working then the router is working and your wireless is your next target.
Try navigating with your phone. If your phone works, problem with your computer's wifi.
What is the model of your Meter? Normal meters have set ranges on them depnding on style, make, etc. And are you Testing 220VAC or 220VDC? if AC you select the ~ with a "V" beside or under it. and if you have set ranges on your meter. Select 300VAC ~ or higher. if you set the meter lower than that it will blow the fuse.
Here are general instructions on how to use a Voltage/multi meter.
Maybe the band is too loud and drowns you out.
Seriously, when the band is there, not playing
anything, try the volume. Add more instruments,
constantly checking the volume. My guess is
to tell the group to lower their volume so the
parishioners don't go deaf.
What is the type (input, output, power) of the rectifier.
If controllable - may be the control PCB or thyristor. If not controllable - 10 V DC instead of 230 V DC is hardly believable. In this case the rectifier may be OK, but the input - low. If you have a voltmeter, check the input AC and the output DC if the output has about 200 V AC you may have shortened diode.
