Power present; data unknown
This is a valid partial result—for example, USB-C PD may supply power while data remains untested. It does not prove the data path works.
All tests
Runs locallyNo accountNo install
ONLINE HARDWARE TEST
USB Port Test
Use a known-working device to record and compare the USB ports on this computer.
You confirm the physical port labels; KeyTest records the evidence.Browsers cannot discover connector count or map a device to a left, right or rear port. Use the editable plan below, then test each port with the same probe.
SET UP ONCE
Confirm this computer's physical ports.
Checking WebUSB…
- 1Testing now
- 2Waiting
- 3Waiting
CURRENT PORT
Record what happens.
1
Does the device receive power?Look for a light, charging indicator, fan, or startup sound.
2
Does this computer detect the device?Check Device Manager, System Information, or the device's normal behavior.
3
Browser check OptionalWebUSB is unavailable here; the two checks above are enough to record a result.
Record at least one result above.
PORT COMPARISON
No ports recorded yet
Complete the current-port form above, then save it. Your comparison will appear here.
LOCAL DIAGNOSTIC REPORT
USB port test result
Build the physical port plan and save one row for each connector.
- Planned ports
- 3
- Recorded ports
- 0
- Passed
- 0
- Partial / unknown
- 0
- Need review
- 0
- Port results
- None
What this result supportsThe recorded manual power and operating-system observations for each named physical connector, plus any browser-visible USB metadata that was available.
What it cannot proveFull electrical compliance, sustained transfer speed, cable quality, USB Power Delivery profiles, hidden device classes, or connector location without the tester's physical labels.
One port fails consistently
If the same known-working probe succeeds elsewhere, the failing port or its internal path deserves inspection.
WebUSB cannot see it
This is common for protected device classes and does not by itself mean this computer's port is faulty.
This workflow tests the USB host ports on the computer running KeyTest. Results stay in this page and reset when it is reloaded.
ABOUT THIS TEST
Fast answers without installing software.
Use a known-working device to record and compare the USB ports on this computer.
Browser limitation: Browser diagnostics provide practical signals but cannot replace physical inspection or professional repair.
Diagnostic input is processed locally for this test and is not uploaded by KeyTest.
RELATED RESOURCE
Is the keyboard failing too?
Compare the key pattern with the keyboard troubleshooting guide.