Cisco 3650 Stack hangs on boot

I have a brand new stack of 3 Cisco 3650 switches

2x48 ports
1x 24 port

Each switch is able to boot up independently but when I connect them up with the stacking cables they boot up show a log that the stacking port has been enabled and then they just hang there.
I left it on for over an hour in case it was pushing firmware to one of the other switches but no luck, still on the same prompt.

Not even sure where I should start to troubleshoot this.
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PerimeterITAsked:
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ffleismaSenior Network EngineerCommented:
A few things I would suggest.

Check the IOS version on each and ensure that you have the same version for each. "show version"
Ensure that you have connected the stacking cables correct, something similar to the attached image below.
Cisco Stack
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PerimeterITAuthor Commented:
The stacking cables are installed as in your diagram

These are the show version outputs. What does it mean by "INSTALL" ?

Switch Ports Model              SW Version        SW Image              Mode
------ ----- -----              ----------        ----------            ----
*    1 28    WS-C3650-24PS      03.07.00.E        cat3k_caa-universalk9 BUNDLE

Switch Ports Model              SW Version        SW Image              Mode
------ ----- -----              ----------        ----------            ----
*    3 52    WS-C3650-48PS      03.07.00E         cat3k_caa-universalk9 INSTALL
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ffleismaSenior Network EngineerCommented:
I'm not too sure the difference between BUNDLE mode and INSTALL mode and I can't comment on that, but I saw an article from Cisco that might help you resolve the incompatibility.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/3se/system_management/configuration_guide/b_sm_3se_3650_cg/b_sm_3se_3650_cg_chapter_010101.html

Ctrl+F (Upgrading a Switch Running in Incompatible Running Mode)
Upgrading a switch running in incompatible running modeHope this helps a bit.
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PerimeterITAuthor Commented:
The issue was that the switches had a slightly different version of firmware between 48 port and 24 port units,
The switches with newer version of IOS had to be completely booted up first. Then the other unit pulled its firmware from the others successfully.
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PerimeterITAuthor Commented:
Found the resolution myself
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