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HP PRO 3400 Series MT

By noodlemouse ·
Hi All,

I need some help.

We have a HP PRO 3400 Series MT PC, when we add usb HUBS with GSM devices the system runs fine for about 3 hours, after this the screen goes black but you can still see the mouse cursor and the keyboard seems fine.

Its all fine with 3 HUBS and 21 gsm devices but more than that the system goes all wonky.

I hare replaced the CPU, PSU, RAM and motherboard with luck

6x USB 7 port hubs
42x gsm devices

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Repost as 'Q&A'

by HAL 9000 Moderator In reply to HP PRO 3400 Series MT

Try reposting this in the 'Q&A' forum. The 'Discussion' forum is for matters of general discussion, not specific problems in search of a solution. The 'Water Cooler' is for non-technical discussions. You can submit a question to 'Q&A' here:;content

There are TR members who specifically seek out problems in need of a solution. Although there is some overlap between the forums, you'll find more of those members in 'Q&A' than in 'Discussions' or 'Water Cooler'.

Be sure to use the voting buttons to provide your feedback. Voting a '+' does not necessarily mean that a given response contained the complete solution to your problem, but that it served to guide you toward it. This is intended to serve as an aid to those who may in the future have a problem similar to yours. If they have a ready source of reference available, perhaps won't need to repeat questions previously asked and answered. If a post did contain the solution to your problem, you can also close the question by marking the helpful post as "The Answer".

Are these USB Hubs Powered or Unpowered? If they are unpowered I would hazard a guess that they are dragging the 5 V DC Rail low causing the problem when you have the USB Devices connected.


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