Laptop HP 630, generic peripheral MIDI usb not recognized

I have a problem with a laptop HP 630 of all nine (clearance stock) (LV425PA #ABG): this is not to recognize a generic USB MIDI device (keyboard). When the unit is plugged in, I get a message "USB device not recognized". He calls an "unknown device" Manager of devices and says "Windows has stopped this device because it has reported problems. (Code 43) ». The computer has been reset with a minimal installation of Windows 7 Home Premium 64-bit for the recovery partition, with all the HP and Microsoft updates applied, but still refuses to recognize the device.

I also have a new (stock clearance) desktop HP 4000 P. This computer immediately recognizes the keyboard when it is connected and properly installed the drivers for it. Even before installing updates - it works straight out of the box. We can exclude the device MIDI as the cause of the problem. Apart from the obvious differences of chipset, the only other difference is that the 4000 P running the 32-bit edition of Windows 7 Home Premium.

I would appreciate help with this question, because the reason I bought the 630 HP was in first place for the use of MIDI, and it will have been a waste of time and effort if it can not be implemented in this role.

After much effort, I have determined that it is a subtle hardware problem. The MIDI keyboard USB works fine on two other computers, but not the 630 HP. Similarly, several other USB MIDI devices have worked without difficulty on the 630 HP. Only the specific combination of HP 630 and the particular MIDI keyboard fails. It turns out, however, that they work if connected with a USB cable that is shorter than the one supplied with the keyboard. It is only the combination of three-way MIDI keyboard, cable USB and HP 630 that fails. Change any part and everything works.

Obviously, this sensitivity to the length of the cable means that something is a little marginal on the hardware, but the fault seems to be shared between the two HP 630 and the MIDI keyboard, since they both work when paired with anything else on the same cable. I'll have to wait and see if there are other problems in the normal conditions of use.

Tags: Notebooks

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