2013 15" rMBP can not boot if thunderbolt dock and external disk array was connected at the same time

I had connected Belkin Thunderbolt dock and Pegasus R4 to 2013 15" rMBp via thunderbolt port
When I start up my laptop,
The boot progress stopped at the apple logo,and not keep go on。
Can somebody tell me how I fix this issues

Yes! My MBPr boot up by internal Disk
I had try all day。If all external hard disk had connected to the dock , and the dock connect to MBPr via thunderbolt port
I will be login into system
But if dock connect one of thunderbolt port and Pegasus R4 use the other。
System will not boot up sucessfully

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2013 15" rMBP can not boot if thunderbolt dock and external disk array was connected at the same time

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