Back in the day, there were some hacked clients that actually had a client that had an option to crash a server, and work, but they're all outdated. LOIC is made by 4Channers, so you obviously know it isn't gonna work. Yes Psychotic is right, DoS/DDoS will work, but you'll need not only a strong booter, but also a good internet connection. If you're trying to boot someone with a dial-up internet connection, you're just wasting your time.