Try inserting a folded piece of paper or a business card between the back cover of your phone and your battery. If this doesn't work, there may be another issue. If this is the problem, your phone will have been getting less and less battery time in between charges.
Try cleaning out the phone's charger and charger port with compressed air or try using another microUSB phone charger to power your device. Placing some paper or cardstock between the battery and the phone should increase pressure on the speaker and maintain the connection between the contacts the volume button. If this is the problem you may have to clean the contacts with electrical cleaner, if the problem persists you may have to replace the buttons.
Try cleaning the back paneling with compressed air and resetting your blackberry. Try replacing your headphones. If this doesn't work reset your phone's software and clean out the audio jack in your blackberry. This typically occurs when the software on your computer is a newer version that doesn't support the outdated software on the Blackberry, causing the two to fail to communicate.
Visit the RIM Blackberry support page and follow the steps to reinstall or install the correct software. Reset your phone, restart your computer, and in some cases uninstall and reinstall your Blackberry desktop software. USB ports can accumulate dust from continual usage and exposure.
This can interfere with the electrical contacts in USB ports. The easiest way to check is to replace the cable. Like most electronics, Blackberry phones use a micro USB connector. This means that you can reuse cables from other electronics, like digital cameras and older cell phones. Usually because programs freeze up and become unresponsive. There is no force quit or task manager on the OS to end disruptive programs, you just have to reset the phone. You can use the alt shift delete method, but most people end up just disconnecting the battery and turning the phone on again.
Hard reset If neither of the above resets work, do the following: Remove the back cover and pull out the battery just enough so that the phone loses power.
Reinsert the battery and power your blackberry on. The backlight could be burned out or the LCD could be broken.
If you're not sure if the rest of the phone works, plug it into a computer to see if you get a connection. The Blackberry's red LED will come on for a few seconds, then the screen will turn white and show an hourglass. Next the display will shut off, followed lastly by the phone itself. It will then wait a few seconds and start this process again. This cycle is called "nuking", and is very hard to get out of due to it not being able to respond to a computer during its cycling.
If you go through all these steps all data including contacts and apps will be deleted, so hopefully most of it is backed up onto your computer. If not, you will have to start from scratch. Locate and open the Blackberry AppLoader and proceed through the pages until you reach the page titled "Communication Port Selection".
The next step must be done very quickly. This should take your Blackberry out of its reboot cycle and allow you to reinstall your OS. Continue through the program to reinstall your OS, which should be followed by a minute reboot period. You can try scrolling vigorously to dislodge the trackball. If this doesn't work, you will most likely need to replace it or clean the copper contacts underneath the trackball. If the buttons still don't work, you will most likely need to replace it.
Check your phone's settings to make sure that your phone has radio use turned on. If the blackberry's connection to the antenna shorts out or the solder breaks, you won't receive any service. Try replacing the antenna.