If you have allready fixed it, lets see if I'm right. I have a 99 Silverado with the exact same problem. What is happening is the power to the display is being interupted through the trip/re-set switch ( the small rod shaped plunger you depress to change from mileage to trip odometer). The display gets it's power through this switch. What you are pushing is just the plunger. It goes down and actuates the actual switch, which is a little square switch soldered to the printed curcuit board. It is about one quarter inch in diameter with a little red button in the middle of it. I've had my entire dash cluster out in my hands playing with it and was able to get the display to blink on and off while wiggling the switch with a screwdriver. Keep in mind I was allways aware of the other items on the PCB, as not to short out anything with the screwdriver--Be Carefull!! I do not know if just the switch is available or not. I have not fixed mine yet, as of this writing. I sprayed mine with some electrical contact cleaner and it seems to work a little better than it used to. Good Luck--Was I right??