Andreas Bockelmann wrote on 8/16/2017 4:48 AM:
> Hello,
>
> this mornig I tried to connect an external 2,5" HDD which was running on a
> USB2 Bridge from an external case on a USB3 Bridge from another case. (I
> wanted to check whether I could switch HDD to standby with another USB
Bridge)
>
> Raspi did not start with USB3 Bridge plugged in and after disconnecting USB
> device an rebboting the Raspi it also doesn't come up. No signal on HDMI
> monitor. Red LED is lit up, green LED is flickering but it does not boot up
> or power any USB devices.
>
> Is there any fuse I can check?
>
Probably not the "fuse" since they don't blow, rather are self resetting.
Have you checked the power wall wart?  It likely can't power the USB drive,
they require a lot of power when starting.  I used a cell phone wall wart to
power a rPi without a hard drive and it worked for a considerable time...
until it blew.  It would read the right voltage with no load and my cell
phone would say it was charging from it, but the voltage would drop to about
3V and the phone wouldn't actually charge.  Of course it wouldn't boot the
rPi at all.  I got a power pack with enough current capability and it works
much better now even with accessories attached.

--

Rick C

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