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January 2nd, 2006 22:00
BIOS will not boot with APC UPS connected
I have two UPSes, an APC Back-UPS ES 725 and an APC Back-UPS ES 500, which I have connected (one at a time) to my Dell Dimension XPS T700r. Either one of these UPSes will communicate fine with the computer while it is running (I am able to install the software, monitor the battery, etc.). However, if I turn the computer completely off, the computer will hang on the Dell boot screen logo if the UPS is still connected. If I turn the computer back off, disconnect the USB cable to the UPS, and then turn the computer back on, it boots fine.
Obviously this is not affected by the operating system since the problem occurs before the BIOS has finished loading, but I have tried this with both Fedora Core 4 and Windows XP on the hard drive. I have the latest BIOS installed for this series (A11). No other USB devices are connected to this computer. I have two other computers (not Dells) which I have installed these same UPSes on, and this problem never occurs on them.
Should it make any difference, legacy USB devices are disabled in the BIOS configuration.
Thank you for your help.
Obviously this is not affected by the operating system since the problem occurs before the BIOS has finished loading, but I have tried this with both Fedora Core 4 and Windows XP on the hard drive. I have the latest BIOS installed for this series (A11). No other USB devices are connected to this computer. I have two other computers (not Dells) which I have installed these same UPSes on, and this problem never occurs on them.
Should it make any difference, legacy USB devices are disabled in the BIOS configuration.
Thank you for your help.
Message Edited by dpward on 01-02-2006 07:36 PM
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RoHe
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January 2nd, 2006 23:00
Ron
dpward
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January 3rd, 2006 06:00
Majestic
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January 3rd, 2006 11:00
Dpward, you are correct the XPS T model only offers a Legacy USB option in the BIOS. The BIOS option RoHe mentioned is found on the Dell models newer than yours. With the Legacy USB option disabled the USB ports should be inactive during boot up.
As for your problem I would double check the Boot menu and Hard Drive sub-menu to see what is listed. In the Boot Order I would make sure the hard drive is listed as the first boot device and in the hard drive sub-menu make sure the bootable add-in card is listed first. If that doesn't resolve the problem then I would check to see what configuration settings the UPS backups had. Possibly there is a setting which can be disabled related to booting that the UPS has although it shouldn't have any effect with the Legacy USB setting disabled.