well it could be something internal in your system bios ...... to check this u have to shutdown ur system restart it and press one of several keys to trigger the bios rom screen ....... usually its pressing the delete key on start or F1 ...... then scroll thru the menu that comes up with ur arrow keys ....... dont change anything ur not sure of in this as u can make ur system not even start .......... look for somthing labeld PC health status ...... check the temps it has set for warnings and auto shutdown ...... some motherboards have this built into the bios ...... on other pcs u can dl a program called MotherBoard montior that does roughtly that same task ....... but either way your problem may not be mirc related if your running a clean version of mirc along with that aol connection
its related to something else entirely id have to assume