USB devices may not work correctly when they’re connected to certain USB ports e.g. They stopped making PCI USB hub cards a long time ago, probably for that very reason!Īll the ones you can get now are USB 2.0 Controller cards. A port physically built into the mboard or a PCI controller card that is one of a pair that connects directly to a USB controller is not in that type of hub. More things work with “powered” hubs that have an external power adapter connected to them so all ports can have up to 500ma each (usually they can’t actually do that), but still, those do not work with everything.įront USB ports on a desktop case, the ones that are lower down on a tower, are almost always individually wired to the pins for a port on the mboard – they are not in a hub of that type in that case. Additional USB ports in a printer or a keyboard or a scanner, etc., ARE that type of hub. Ports built into the front of a desktop tower case higher up MAY be that kind of hub. External hubs you plug into only one port ARE that type of hub. Simply put, USB hubs DO NOT work with all USB devices – they never did, and they never will !īy hub I mean the kind that has multiple ports that plugs into only one USB port, or that is wired up to only the pins for one USB port on a mboard header. I connect all, all lights lit up … machine hangs on startup (during discovery of USB devices).I have 5 USB plugs on my PC, changed to each of them : all the same problem.So, what does work ? If I connect each of the USB devices I have (keyboard, mouse, printer, memory, HD) to any of those USB connectors on the PC, there is no issue at all.What is going on ? I also had this problem : … ( solution there : my USB floppy drive does not work when other USB’s are connected, this is a direct connect, no hub) Sometimes he starts up OK, then just loses connection without any reason, one or 2 minutes later it comes back.So, I got a USB hub now, but one powered with an adapter. When I used that one, sometimes the machine does not find the connected USB devices on startup. I had a USB hub, 4-ports and NOT powered by adapter.
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