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Computer won't boot with 2 hubs attached! Why not?

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teknomedic:

With all that gear, the first thing I thought was your power supply... what size is that?... it's about the only spec you didn't report in your first post.

SavannahLion:


--- Quote from: teknomedic on August 14, 2007, 12:34:03 am ---With all that gear, the first thing I thought was your power supply... what size is that?... it's about the only spec you didn't report in your first post.

--- End quote ---



--- Quote from: rodneycrystal on August 12, 2007, 10:17:54 pm ---I have power adapters plugged in for both hubs and the power lights are on.
--- End quote ---


teknomedic:

That noted... it's still important to post PSU specs for troubleshooting....

................the following was found on another website, maybe this will help, maybe not................

I had the exact same problem with my new hub, which requires external power supply (I had no problem with my old hub which was powered directly through the USB ports). I used to cut power supply to the hub whenever I turned on or restarted the PC, otherwise it would not boot past the POST screen. Only when Windows loaded could I enable the hub. Both the old and the new were USB 2.0 enabled.

I looked up my problem on the net and found some possible solutions. The one that worked for me was to change the USB 2.0 setting from HiSpeed to FullSpeed. Now all my USB devices are recognized by the BIOS and the system always boots properly.

However, I will also post here some more solutions that worked for other people.

1) Disable ACPI 2.0 support in BIOS.
2) Disable APIC support in BIOS.
3) Disable USB Legacy support in BIOS.
4) Make sure that the boot sequence in BIOS does not include and USB devices.
5) Insert an additional USB controller in the form of PCI card and connect the hub (or any other USB device which causes problems) to this card’s ports.
6) Try various combinations of input devices:
a) PS2 keyboard / PS2 mouse
b) PS2 keyboard / USB mouse
c) USB keyboard / PS2 mouse
d) USB keyboard / USB mouse

Right now my working BIOS settings are:

PS2 mouse support : disabled
ACPI 2.0 support : yes
ACPI APIC support : enabled
USB function : enabled
Legacy USB support : enabled
USB 2.0 controller mode : Full Speed

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