W7 Dell XPS 8300 printer usb ports not detect

Hi, mironso, thank you for the suggestions.

Unfortunately I don't have access to another PC to experiment. But two different printers previously working for this same PC both suddenly stopped printing suggested to me the problem is on the PC side. The testing directed by the Brother tech was done on the DCP (multifunction monochrome laser copier) printer which was online. But the first printer expierenced the problem was the MFC All-in-One Printer.

Regarding to your suggestion "Try to remove USB drivers and add them again" I should have reported the following in the initial post. For the DCP printer, I reinstalled the printer driver software twice, once from the CD and the other from the web. Both failed with the final message
"Please consult with your device manufacturer for assistance getting this device installed. USB composite Device (RED X) Failed"
If USB composite Device meant the Borther DCP, this message contradicts the Brother's own tech.

The Dell PC has been function OK for the last two years, but its earlier record was not great. I copied my own notes two years ago in the following.

"After repeated Internet connection failures, on Wednesday (about 90 days after I bought the Dell PC) I spent two hours from 7 to 9 AM with a new (ignorant) tech in India. Then FedEx shipped the motherboard overnight. The local tech Greg shown up at home on 10:00 AM Thursday. He is the same one who replaced shrieking/clicking CPU fan when the PC was only 20 days old.

He said the problem from this embedded Broadcomm network card(?) for XPS 8300 series is a fairly recent phenomena. After two or three months these units are now failing en mass. In one week he replaced 9 motherboards. For one PC, the owner after three failed replacements decided to buy a different Network card which occupies the slot already used in my machine by the AMD Radeon video card. I don't know what is the fate for my new motherboard. Does this mean I need to pray? I spared you the other stories of this Dell PC."

This is an update. My Dell XPS 8300 was bought in Sept 2011 so the connection to the Brother MFC printer had no problem for over two years. The Brother DCP printer was bought in Sept 2013 and connected to the Dell without problems. The printing function from the Dell XPS 8300 stopped about 10 days ago.

Yesterday my daughter family brought in their old Dell Laptop. It was connected to the Brother DCP printer and can print files with no problem. To me this is another proof that my Dell XPS 8300 is the problem.

The Dell PC has been function OK for the last two years, but its earlier record was not great. I copied my own notes two years ago in the following.

"After repeated Internet connection failures, on Wednesday (about 90 days after I bought the Dell PC) I spent two hours from 7 to 9 AM with a new (ignorant) tech in India. Then FedEx shipped the motherboard overnight. The local tech Greg shown up at home on 10:00 AM Thursday. He is the same one who replaced shrieking/clicking CPU fan when the PC was only 20 days old.

He said the problem from this embedded Broadcomm network card(?) for XPS 8300 series is a fairly recent phenomena. After two or three months these units are now failing en mass. In one week he replaced 9 motherboards. For one PC, the owner after three failed replacements decided to buy a different Network card which occupies the slot already used in my machine by the AMD Radeon video card. I don't know what is the fate for my new motherboard. Does this mean I need to pray? I spared you the other stories of this Dell PC."

When I wrote in the earlier post "But a USB stick or other devices works fine in these same back, front, and top USB ports," I had not realized the creeping deteriorating failure of the USB controller yet. In hind sight during talking to the first Brother tech, there was still one USB shown in the Printer Properties' Ports list for my W7 Dell xps 8300. USB totally disappeared when I talked to the second tech.

Apparently the USB controller issue fails my image and file backup tasks as well, as I use a USB drive as destination. Yesterday (11/30) my daily file backup program BackUp4All issued "Last backup failed" (in red) instead of the usual "Last Backup was successful" (in green). Now this also happened for those every Sunday backups too. I noticed the drive letter designation was changed from K: to E: and I am not allowed to change it back (K: was not in the allowed list).

When I attempted restoring with the TeraByte's image backup program, the keyboard navigation did not let me choose my backed up file on 11/29. And the weekly image backup failed on 11/30 too.

It seems to me there is no Dell authorized service for out of warranty repairs and given the track record of this desktop or model, I need really pray hard that who ever repairs our Dell knows what he is doing. But first I need to know what is wrong, how much the parts and labor estimate is, and whether it is worthwhile to repair.

Any comments on my homework/conjecture and suggestions will be appreciated.