Tough call. Troubleshooting is taking things one step at a time. Go back to basics removing one hardware component at a time until the problem goes away. Same goes for software probs; remove one program at a time until the problem goes away.
Certainly more detail would be helpful if you want a better answer. What, specifically, is your problem? List as much detail as possible. Hardware configuration, software/OS, did the computer work before "X" was installed/added etc.