How did I kill 2 iMac's?

Long story, so short points.
Originally purchased 20" white iMac in April 2007.
Upgraded to 3GB RAM in June.
Upgraded to Leopard end October.
Attached the whole time to the iMac:
Belkin 7Port USB HUB with attached:
Two 500 LaCie drives
One WD 500 Drive
Headset and Mic for SKype
Attached to the iMac 80GB Video iPod.
When upgraded to Leopard has issue with TimeMachine 'pending' for hours and not been able to access the directory on my time machine drive. (maybe a side issue, not sure)
Start of December my iPod decided not to sync, it would start to sync 1 of X amount of songs and get stuck on number one.
A week or so latter my external drives would decided if they would mount or not.
First week of January this year I took my white 20" iMac to service center, they found issues with the USB ports, replaced the logic board, and still found issues with USB ports.
Apple replaced iMac with new 20" 2.4Ghz iMac.
Swicthed on iMac attahced HUB and check iPod, everything worked.
Unplugged and put in one 2GB stick of RAM
Swicthed iMac back on, then started to have same issues again, ie) iPod not syncing, hard drives decided if they should work or not. (iPod does synch when connected to HUB, but random USB ports keep on not working)
Took ram out, same issues.
Did power management reset, Pram reset. Same issues.
BTW: also have MacBook and partners iMac in house. My ipod works on both machines, and my partners iMac performs the same on my iMac, ie) not synching. So not iPod issue.
Use external drives via Hub and my MacBook with no issues, but not plugged in for long periods on MacBook.
Apple now thinks that my HUB has damaged both machines.
So I'm no loger going to use the Belkin USB hub and have purchased a Targus hub for the next machine, but I'm worried that something else might be going on.
Do you think it might have been the HUB?
The RAM?
Or really bad luck to have two faulty machines?

I have a Staples brand 7 port hub and I have had no problems with Leopard. But, I have my Mac set up to never sleep. I will let the screen power down. I will let the hard drive spin down. But I never sleep.
This is because I have some background things scheduled late at night like SuperDuper Backups, and sometimes let video jobs run all night.
Message was edited by: AppleMan1958

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