G System power comes on, but nothing shows on display. Any ideas?

G System power comes on, but nothing shows on display. Any ideas?

G system worked several years ago, stored it away for a while, recently took it out and hooked it up again.  The power light comes on, but nothing shows on display screen.  It’s like it’s dead, the light is on, but no one is home.  Please help!

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Source: http://forum.tcelectronic.com