Instrument Panel lights turn off when dome lights turn on

[bpinoy9274]

Just as it says, when the headlights are on on my 2007 Tahoe LTZ and I turn on the dome lights (front seat, back seat, or third row seats) the back light on the instrument panel (spedometer, RPM, oil pressure, etc.) turn off. Also, there's only one back light that works on the steering wheel controls (radio, cruise, etc.) all others have gone out. I've checked all the fuses and all are in tact. We bought this vehicle used 5 years ago and never encountered a problem until now. There's only 89,000 miles on it, bought it with 30k. Anyone else ever encounter this? Any help would be greatly appreciated

Thanks