Engine won't start, all other electrical fine

I have a 2001 Tahoe LS. Got up to start her and...nothing. All electrical seems fine. Radio, power seats/locks/windows. Even the headlights and fans work. I checked all the fuses in both the passenger and engine compartments that relate to ignition/starter/crank. They are all good. On the fuse boxes there are these big grey blocks that I assume are some type of relay. Can those be pulled out and checked? Was afraid to try.

From the above I assume the battery is not the problem so I did not jump it. Does anyone have a suggestion on what to try next? I really thought the fuse would be the problem. Thank you for any help you can provide.

Rick Herrick

Hey man my 03 tahoe just was doin the same thing its goin to the dealership tomorrow i will let you know what they say.

My 03 is also doing that. Did you ever find the problem?

In my case it was the alternator. $450...

Mutt

I have a 2003 tahoe that had the problem. Fuel pump was the problem. About 41,000 miles. Luckily, I had an intermittent start problem that GM was aware of while under warranty and they replaced the fuel pump. Would have been over $700.

I have a 2003 Tahoe Z71 that has a problem. Something is draining the battery. I replaced it and now the second one has died. Dealer had no idea. Said it was a bad bolt connecter!!! Any idea what could be the cause of my problems?