I'm under the serious impression there's something wrong with my MacBook. I've got a 2nd-gen MacBook, running Tiger 10.4.11, and it's only got 1GB of RAM and a 2.0GHz Intel chip. It's worth noting that everything in the computer is original except the hard drive. The hard drive (it's 120GB) was replaced in May of this year after a freak meltdown destroyed the other one. All other components are nearly 2 years old. I had a suspicion my problems below may be related to RAM, but I decided to hit these forums rather than hit the computer store for a $90 4GB RAM upgrade. Problems: Computer occasionally will not respond to Restart or Shut Down commands and must be hard-shutdown. FireFox, Shiira, and Camino will sometimes not load pages the first try. Computer occasionally will not mount flash drives or audio CDs. iTunes also will occasionally not recognize audio CDs. Cooling fan will sometimes start blowing really hard when the CPU usage is hovering around or below 20%; normally, it turns on high at 55%. - I don't feel like being the "Elitist Mac Kid" and being cocky about Macs not getting viruses - I have a bad feeling that that's what's up, and I don't know how it could have happened. I have NEVER had any problems of this nature with my MacBook before. I have also not modded the system in any way recently that would have caused side effects. If anyone could offer me any pointers on what may be going on and how I could remedy them (ie RAM upgrade, (preferably free) antivirus software, etc) I would appreciate it greatly. Thanks.