Large farva what issue did you have with your HP to lead you to blame the UPS? This to me still sounds like a solution looking for a problem...
I had my HP Pavilion H8 Tower, monitor, cable modem and wireless router connected to my APC Back-UPS Pro 1000, which was a 1000VA (I forget what the wattage was, it was most likely a 600W). Everything ran fine until I had an outage on evening. I think it was more of a brown out than an outage, as the power came back on very shortly afterwards, within a few seconds. Everything connected to the APC Back-UPS unit stayed on once the unit kicked over to battery power, except for the tower. The my HP 2311 23" monitor stayed on, but went black, as if it lost signal, you could still see the power indicator light, also my cable modem and wireless router stayed on.... Like I said in my previous post, my opinion is based off my experience, and what I've heard. Granted, talk is talk, and anything could have happened to make the tower cut off while my other components stayed on, but it makes sense to me, that the cause of that issue was that the power supply wasn't able to run off of the power the battery inside the UPS unit produced.
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Uh, how about the
Apple Store?
Who places product on the Apple Store website, and creates descriptions for the products? Granted, there are reviews on there stating that those particular units work great for their iMacs. That's great for them. If they believe it works great, then they use it.... Again, I'll say it, I'm going on what I've heard. Therefor, I'm relaying what I know, from what I've heard and the incident that occurred in my own experience in an honest effort to possibly help people. But that seems to be such a huge no-no apparently...