[aiharkness]

You do need to make sure you do not have a power problem. Make sure the battery is tight in the compartment and that terminals and contacts are clean and not bent. Plug into a wall charger and leave for an hour. Then while still plugged in, remove the battery for a moment an replace. If it does not boot, it would be a good idea to try with a battery that you know is good.

You also need to remove the micro SD card if you are using one. If the device boots, then the card is the problem.

If not power and not the card, then the next step is to wipe the device and then reinstall the device software.

See blackberryfaq.com and the article on JL_CMDER. Use this to wipe the device. An alternative is to use BBSAK.

After wiping, install the OS from your carrier, or see the latest OS thread for your model here on the forum.