2 USB ports stopped working on Apple Cinema Display

My two USB ports in my Apple Cinema Dispaly stopped working at once. As it doesn't help to do the regular reset of USB or to start up from another HD, it kind of looks like a hardware problem. I just find it weird that this problem suddenly happened in BOTH USB ports while I had all these other software related issues.
I have done disk utility verify+repair, SMC, PRAM, etc. I run the latest software.
QUESTION: Can I run the Apple Hardware test with the Cinema Dispaly connected to see it it really is a hardware issue?

The USB hub in the display is run by the USB cord that is supposed to be plugged into the back of the computer chassis near the display cord.
Is it still plugged in properly?

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2 USB ports stopped working on Apple Cinema Display

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