Sierra won't start

[Mr.ranchester]

I have 2007 GMC Sierra 2500HD classic, I tried starting it today and all I got was a 'clicking' noise. All the dash lights, radio, etc. work. I checked all the ignition fuses, nothing blown, any ideas?

[r1byker]

Dead battery. Is that the original? You got about a year longer on yours than I have on mine.

[txab]

Clean battery terminal connections. Then get the battery tested