Garmin c330 will not power up
Assuming that your power source is known to be live (ignition switch on?), the first suspect is the power cord, including the fuse inside the big plug. On the tip of the plug, the silver nut should be tight but the plunger in the center should move when you press it. To check the fuse, unscrew the silver nut. Take out the fuse, which looks like a glass tube with a wire inside - the wire should be unbroken. Better yet, check the fuse with an ohmeter. At the other end of the cord, disconnect and re-seat the connections to make sure they are secure. If using the suction cup mount, you'll need to unclip the unit from the mount to do this. Another possibility is a bad battery inside the unit. My C330 kept going off and on due to a bad plug/fuse assembly. When I switched to a friction mount, it came with a new power cord and the problem went away.
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