Member Avatar for pat22ryan

Non of the USB ports on an INTEL D865PERL motherboard, or the front panel connector(s) will respond.

BIOS settings = enabled
XP HE Device Manager indicates all are working.

I have:

Reinstalled the BIOS (just in case)

Disabled then abled the individual ports

Reloaded the drivers.

I suspect a MB component may have failed. Your thoughts?:?:

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Brief context: has a D865PERL whose USB ports are all dead; earlier replies from and touched on cabling/hubs. The checklist below focuses on hardware-level isolation you can do safely and without repeating steps already covered in the thread.

  1. Reset CMOS and perform a minimal boot
  • Clear CMOS (jumper or remove battery a few minutes) to rule out odd chipset configuration. Boot with only PSU, CPU, one stick of RAM and keyboard on a rear USB port to see if the controller powers and the keyboard responds at POST.
  1. Measure the USB power rail (VBUS) before touching data lines
  • With the board powered, measure DC between a USB port VBUS pin and chassis ground (consult the board manual/header pinout before probing). Expect ~5 V. If VBUS is 0 V, the problem is power/fuse/regulator related. If VBUS is ~5 V but devices won’t enumerate, the data side or controller is suspect. Use extreme caution when probing live boards.
  1. Test for shorts and protective parts
  • With power off, use continuity mode between VBUS and ground. A near-short suggests a shorted device or protection fuse (SMD polyfuse) blown. Visually inspect the USB area for cracked/bulging capacitors, burned resistors, or damaged ESD diodes; these parts commonly fail and are replaceable if you can solder SMDs.
  1. Rule out the OS and drivers quickly
  • Boot a Linux Live CD/USB or a Windows PE environment. If USB devices show up there, it’s an OS/driver issue; if not, it’s almost certainly hardware.
  1. Repair/workaround options
  • If a fuse or diode is bad and you can solder, replace the SMD parts. If the Southbridge/controller is dead, the practical fixes are board replacement or adding a separate USB controller card.

Safety note: disconnect mains before visual/continuity checks and avoid probing pins blindly. If uncertain about SMD work, seek a board repair shop.

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Member Avatar for BeastOverlordH6

Yea, you've gone through what I would have done. Looks like you're going to need a PCI USB hub, or I suggest you check the USB connectors on the motherboard, and the condition of the wires, and such. Flip the configuration of the pins if necessary, experiment around.

Member Avatar for JANINE

Check your Motherboard USB headers and also check your motherboard and Case manufacturers documentation.
connected to the board.

Result - I just left the two case ports and
I experienced a similar problem until I discovered that the Motherboards USB ports wont work when the Case USB ports were purchased a 4 port powered hub which i plugged into one of the ports on the rear of the machine.

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