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I am getting red X's for all of the engine instruments upon G1000 power-up, prior to engine start. The problem has been intermittent over the last several flights but is now much worse.
I have a fairly new sealed Concorde battery that stays on a battery minder while in the hangar.
The red X's appear upon G1000 boot-up and will only go away after a power cycle. One try used to do it, but the last flight took 4 or so power cycles to boot up clean. In my hangar last night, it never went away. If it powers up OK without the X's I am good for the flight. We don't have an avionics shop on the field so I would like to check some basics before calling somebody out. I have read the posts about re-seating connectors and I have purchased some high grade electrical contact cleaner. If it's an issue with the GEA 71, from what I read that is under the baggage compartment? I can pull, clean, and re-seat that. Is there anything else I should check short of going through all of the sensors?

GEA71 is located behind the PFD, not under the baggage area.

You may also want to check this thread:

G1000 - Red X Madness
viewtopic.php?t=4098&hilit=G1000+Red+X+madness

You may want to check this as well. I had some wires under the access panel that had the insulation wear out and caused all my engine instruments to red x. It was hard to diagnose, but was an easy fix.

viewtopic.php?t=8676

Thank you everyone. No luck on pulling the GEA71 and cleaning the contacts. I have an appointment with an avionics shop next week.

I'm now going through the same issues with the Red X'ed engine instruments. They red X on power up, but after a trial engine start they all work as advertised. I have reset the GEA71 on the back of the MFD but will try again. It's tough to trouble shoot because it's intermittent. My tack time is 1460 and it's a 2008 XLS model. It has fortunately not happened airborne.

I've also noticed on the AUX page when the GEA1 is intermittently changing from Green check to Red X, the instruments look like they are normal. I thought a Red X on that would give all X's on the instruments.