04-03-2009 07:12 PM
I bought a USB-to-parallel cable so I could use my treasured Laserjet 4M+ printer with mynew HP Media-Center PC. This works fine when I plug the cable into a front-panel USB port, but does NOT work when the cable is plugged into a USB port on the rear of the computer. Other than this, all USB ports "seem" to operate normally. But there is evidently some difference between the two kinds of USB port, rear-panel vs front-panel. Anyone know anything about this?
04-03-2009 08:08 PM
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 9
HP Phoenix ENVY 810-135qe - i7-4770K (liquid cooled); 8 GB memory; GT 640 (4 GB), SSD (Samsung EVO 840-500 GB); 600W PSU; Win 7 Pro
HP Photosmart 7520 AIO
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04-03-2009 10:30 PM
USB can be buggy (hit or miss). The USB port on my NF4 board may not detect a USB drive after a few insert/remove cycles. Only fix is to restart windows. Never come across this anomaly with my P35 board. Both were clean installs of XP Pro.
Sometimes, one USB port can deliver higher voltage/current than another USB port. IRQ mapping may also result in detection problem. The use of an adaptor cable can amplify a compatibility issue. For best performance and stability, use an adaptor that connect directly to the PCI or PCI-E slot.