No signal screen with sneek and di - workaround included in additional information about sneek HOT 8 CLOSED

Do you have bootmii as boot2 or IOS installed?

Bootmii is installed as boot2

I can confirm this. I tracked the issue down to r80. Revisions before then 
work. 

This can be fixed in newer revisions by taking lines 560-591 in di/ehci.c from 
r67 and pasting them over lines 556-587 in the revisions since r80. This is the 
same issue as issue 35.

I am using a Toshiba 500gb 2.5" external drive: http://tinyurl.com/28jy2tf

I think you meant paste over 566-587

I have the same issue since r80 with uneek and a 1Tb WD Elements. Before it 
worked without any problems. 4.2E Wii, Bootmii v4 in BOOT2

Now I use this workaround:
Start the Wii without SD card
Wait for health screen, don't press A! (USB gets initialized by the Wii)
Plug in SD card
Press reset
Now Uneek loads

Looks like some kind of timeout/initialisation issue that the function "s32 
ehci_control_message" fixed before r80...
As stated by thealexbarney.

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update to r105