Usb problem that hangs Windows system

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Milica Jeftic

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Oct 12, 2014
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I have biostar a760g m2+ motherboard with AMD Athlon II X2 240, 250 gb sata HD and 500W psu. I have this problem. Whenever I plug usb device and try to copy something from it the system (Windows 7) freezes. Windows explorer stops responding and I have to restart the system. I have all the drivers installed, and usb works fine when in Bios, (the files can be read from it), so I don't think it's a faulty hardware. Also USB devices I tried work fine on another PC. I don't know what might be the problem, please help.
 
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I had a similar issue with the same Biostar A760G M2+ board, same CPU and also 500W psu. I found that when I had only 1 stick of memory installed (in either slot), that the USB problem went away. My issue got worse over time and then the system started not initializing the USB ports the upon boot the first time - it took a few reboots to get the keyboard & mouse to work (usb ports). Ironically, it always worked when going into the BIOS.

I looked closely at the board and found two capacitors that were a bit swollen - they're right next to the ram slots and are 10v 1000uF. Knowing this is a fairly cheap board and it was dying anyway, I decided to try to replace them with ones that I removed from another dead board. I put in 16v...
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cmdrdata

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Jun 18, 2009
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I had a similar issue with the same Biostar A760G M2+ board, same CPU and also 500W psu. I found that when I had only 1 stick of memory installed (in either slot), that the USB problem went away. My issue got worse over time and then the system started not initializing the USB ports the upon boot the first time - it took a few reboots to get the keyboard & mouse to work (usb ports). Ironically, it always worked when going into the BIOS.

I looked closely at the board and found two capacitors that were a bit swollen - they're right next to the ram slots and are 10v 1000uF. Knowing this is a fairly cheap board and it was dying anyway, I decided to try to replace them with ones that I removed from another dead board. I put in 16v 1000uF caps and it worked. Both ram slots populated and no more USB boot / hang issue! I suspect that the 10v caps were undersized from the factory and were at their limit, and over time, got swollen and began to not perform normally, causing these weird problems.
 
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