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I had a power failure during a print. After rebooting laptop and Rostock Max, I reloaded file to print, pressed the print button but nothing happens. It's stuck on "homing axis". The only thing a can do is disconnect and reconnect. Any help would be appreciated.

what software you using PC side?

I'm using MatterControl V. 1.2
Windows 8.1

Any ideas anyone?

Tough to trouble shoot with the info as it's possibly a few issues depending on what it's doing.

To start with I'd disconnect the power from the printer including the usb to your PC and leave 5 it mins, then try powering it up.
I'd then check it isolated from the PC just using the LCD, redo your Z Height and test home, preheat etc. Then I'd run a test file off the SDCard If it works... if not...

Possibly your eeprom values have been corrupted by the power loss?? if it was writing to the Eeprom at the time of the power loss its possible... so from repetier host connect to it and see if you can open the Config>eeprom configuration... (If you've ever saved out your Eeprom values you can simply reload them... if not im sure for all the common values over machines outside of PID (will be machine specific values) are available from people on here and you can just upload them?) also you could try flashing your Rambo with the latest software from SeeMeCNC.. as it's a max you'll have done this before I presume?

So yeah tough to tell atm but try some basic tests and feed back how you get on...

Thanks for the reply. I've tried everything you suggested, all the way from completely reupload the firmware and reconfiguring the printer as if it was a new build. Still no luck. i'm for a lost of words. It was printing just fine until this happened.

When you say its stuck on homing axis,,,,, is it actually moving? If so, check your endstop switches, see if one of them them got jammed.

When I press the print button in MatterControl it displays 'homing axis' and the printer does nothing. Usually it will home itself and then start printing

Have you tried printing directly off the sd card? Not using mattercontrol or pc?

Yes I have. When I select the file to Print, it just beeps. What's really strange is that I can manually control everything on the printer. It just won't print.

So when you select home towers from your LCD menu it homes correctly?
When you select Home All from either Repetier or MC it doesn't output "Homing Axis" it outputs "Home Delta" to the LCD status line so I'm confused here...

Also I've just tried MC and it doesn't Home the towers first, it heats the Bed to temp then heats the Nozzle to temp.... then it's Homes Delta.
It's not like repetier where all the control is performed in the custom G Code, the temp sequence is baked in then you do your custom code...
So I'd check you're custom start G Code:
In MC its under Slice Settings>Custom G Code:

In the start G Code Box the default code is only:
G28 ; home all axes
If you've accidentally typed into this box then slicing & saving out any file to SDCard would copy any custom G Code error... Hence why I was asking if you could try one of the files pre supplied on your SDCArd (e.g. The blinky.gco or fan.gco files supplied pre-installed on your card) and not something your slicing now.... it wont help if its a new file your copying over to your SDcard with a "start G code error" incorporated...