Why USB Connection Problem during computer start?

October 17, 2017 at 22:17:20
Specs: Windows 7
we have problem regarding USB key that first unplug and plug than instrument work.
when we start instrument it connect with computer that time no USB connection appear.
we are using assemble computer.

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October 17, 2017 at 23:38:31
I would buy a new pen drive as the one you have may be faulty, a very common problem especially with the cheaper ones.

message edited by phil22

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October 18, 2017 at 04:14:27
Does this happen when the PC is idle for some time?
Did you check the power options if the USB is allowed to "power off" ?

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October 18, 2017 at 13:28:24
Some usb ports are not active til system has booted far enogh to install/enable the drivers. Some ports are active at boot time - dependng n the motherboard.

On most store bought systems the active at power up are on the back od the case; those (if any) on the front are likely nly active after the OS has booted through/loaded...

Which usb ports are you usng; and have you tried more than just one!

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