So my parents just had their logic board on their original aluminum (2007) 24" iMac replaced for quirky USB port issues that popped up on them within the last 30 days of AppleCare. They got the computer back like 2 weeks ago and now my mom is experiencing random/intermittent beachballing while doing simple tasks like typing in a spreadsheet. I have checked their hard drive for directory damage and SMART status failure/bad sectors etc. and everything there is checking out ok. It has never had a problem or repair before and this is concerning being that I believe their applecare runs out today. I'm just trying to figure on what else could be causing it other than a bad logic board since thats the only thing that changed. Other ideas?