HT2494 USB ports not mounting external drives. Would appreciate a way to troubleshoot. Thanks

My MacBook Pro is no longer displaying the drives I plug into the USB ports.
Could someone tell me what might be wrong and how to troubleshoot? It's still under warrantee, thank goodness.
Many thanks to all,
Natalie

I've noticed the Firewire bus to be less stable under Intel chips, but I'm not positive. It may be that my devices are just getting tired.
Anyhow... troubleshooting (when was the last time you cleared the PRAM?)
1. Turn off your MacBook (not restart, power off)
2. Turn it back on, wait for it to fully startup
3. With the power connected and the drive turned on, connect the Firewire drive
If it still doesn't work, can you try a different Firewire cable? I'm guessing the cable probably works fine on your iBok G4, right? If it still doesn't work, it would seem that the Firewire port is not working properly. You can also try booting up with your install DVD and see if Disk Utility can read your Firewire drive. If it does then you might need to reinstall OS X.
USB portable drive
Repeat steps 1 and 2 above
3. Plug your MacBook into AC power (my USB drive will not mount unless I plug into AC power)
4. Connect your USB drive
Again, I'm guessing this drive too works fine with your iBook?
You could try accessing the drive while booting up from the install DVD too. This should rule out whether it is a software or hardware problem.
It's a hardware problem if you can't access either the Firewire or USB drive (on AC power) while booting up from your install DVD. It's a software problem if you can.
Good luck
Greg

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According to the fount of knowledge that is Wikipedia…
https://en.wikipedia.org/wiki/USB
As with previous USB versions, USB 3.0 ports come in low-power and high-power variants, providing 150 mA and 900 mA respectively, while simultaneously transmitting data at SuperSpeed rates.[25] Additionally, there is a Battery Charging Specification (Version 1.2 – December 2010), which increases the power handling capability to 1.5 A but does not allow concurrent data transmission.
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http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c03327635
I would be happy to assist if needed. Please let me know what is your model number? Here is a link that will help you find that out.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00033108
Please let me know.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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hello
how are you every one
i have problem with rear usb port i can use it in safe mod and bios only but it does't work when the operition system start i try to slove the problem i updated bios i have other pc and same specification and it's work without any problem but with this mother borad rear USB ports not work also the USB ports on the case ALL USB PORTS NOT WORKING
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Quote from: Nichrome on 28-January-15, 00:18:47
Hi,
What about if you try to install drivers from your product's page?
http://uk.msi.com/support/mb/Z97-GAMING-5.html#down-driver
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thank you
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HT2494 USB ports not mounting external drives. Would appreciate a way to troubleshoot. Thanks

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