new Gigabyte A75M-D2H motherboard not turning on

I've just got a new gigabyte a75m-d2h motherboard and when I turned it on, nothing happened. I'm guessing it's my PSU.
My PSU is LC-B350ATX 115/230V.

What PSU should I get?
How do you know how much volts a motherboard requires?

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Clarification Request
A 350 Watt PSU? How old is that?

I'm left to guess this is some upgrade to an old machine. Some old supplies have issues such as not being rated for new hardware plus age. At just a few years old, a PSU can be half the capacity as new.

There's another issue in the motherboard choice. One of the PCie slots is x16, the other is x4. Some video cards will not come up in the x4 slot.

The Volts is an odd question. The ATX connection is standardized and you should not be changing the voltages.

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The PSU capacity really depends on what you are going to use it for, general use, gaming etc. It is hard to say how high an output you will require since you mention nothing of what other components you are going to install on/in the motherboard. You cite the basic voltage 115/230v input for your present PSU but not the wattage, which would be the primary concern for service capability.

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