ProBook 4740 s will not feed if USB devices are connected

G ' Day, I have a ProBook s 4740 and after taking the laptop to the site, when I'm home and plugged things back, by pressing the power button would see it for a few seconds and then od light out. The LED above the power would have flashes once and then turns off. Needless to say, it would not start up.

After a lot of frustration, I found that by unplugging all (wired Ethernet and USB devices) and by pressing the power button it would start up and even when starting I could plug the devices and everything is OK.

I had to return to the site today and when I came back again, it wouldn't power up until I unplugged the USB devices. USB devices are external hard drives only, all running through a powered USB hub.

This configuration has worked without any problems for wells in the year I've had the ProBook.

This could be the cause?

Thank you.

The last update :-)

After downloading the BIOS update, I decided to wait until I had a break in things until I applied it. Then around one hour before, I saw the red exclamation mark on the HP Support Assistant in the taskbar. Open it, there was an update of the available BIOS, so I decided to let him do. At this point, no indication that it was the F.60 update.

I hate doing these updates that work at the machine code level where if things go wrong, they can go horribly wrong.

Well, everything went well. Updated the BIOS and restart the computer. I went back in to the support assistant and got the information on the computer, and he says that it is now the F.60 version. If she went from F.43 to F.60

I power it off, wait a minute, then restarted with everything plugged in and it worked correctly.

Thanks again for your help.

Tags: Notebooks

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