Under Android it normally takes a little over 1 minute to boot, but if it needs to recompile all the apps, it can take just over 3 minutes. I have never seen it taking longer than that, so 30 minutes should be lots of time for it to boot, if it is going to boot.
The first thing to do is figure out if the board is dead, or if it is simply the Android image corrupted.
- The no blinking lights is a bad sign, but not necessarily fatal. Does the Blue LED flash as you turn on power?
- Can you connect a serial port to UART0 on the Low speed connection? There should be console messages as you boot.
- Another thing to try is to power-up while holding the VOL- button, this should take your board to fastboot mode and when you run "fastboot devices" on the micro-USB port it should enumerate.
- Final thing to try is flipping the SDCard boot switch and booting the OS loader from a SDCard, it should come up.
Full Disclosure: I am an employee of Qualcomm Canada, any opinions expressed in this or any other post may not reflect the opinions of my employer.