w_tom wrote:
On May 21, 1:35 am, Paul wrote:
If +5VSB is ever "flattened", that can cause the power supply to
go off. The question is, what is the mechanism - badly designed
motherboard, badly designed USB device (spec violation on insertion),
or whatever. A simplemultimeteris not going to do a good job of
highlighting a transient problem. The transient could be quite
short.

A transient that short would never cause a problematic voltage
reduction. And increases wire would not avert that transient.

However the extension cord may cause a USB device to not enter High
Speed mode. +5VSB must be so low as to be defective even without the
USB device. Would still boot the computer. Would appear defective
only on the multimeter. So close to the edge that a USB device in
High Speed mode finally causes the crash.

There exists a wide area between good voltage and a crashed
computer. In that wide region is a working computer and a voltage too
low. A condtion found using a multimeter.

Again, a USB transient cannot be that fast and still crash a
computer. Extension cord wire cannot diminish that current. At least
half the posts here are immediately eliminated if simply measuring the
+5VSB with a multimeter. Without those voltage numbers, we are doing
nothing but wild speculation.
I believe that that you are incorrect. I have experienced the 'puter
shutting down because of a static charge when I plugged a a USB drive
in. The solution to my problem was as simple as raising the humidity to
about 25%. Have not had any problems since.

John