How do I restore my Mac operating system after a botched uninstall of Bootcamp.

I completely botched up uninstall of Bootcamp.I wanted to uninstall and delete Windows 7 and re-do the operation. Bootcamp did not manage an uninstall and I got put back into a Widows install operation.Which won't re-install because it can't fiind a suitable hard disk. I have 4 sata harddrives installed, one contains the Mac OSX system files, one a Timemachine backup and one the Windows system.Other is data.
I have a boot USB. None of the startup keys (Press C during startup,Shift key, Cmd R ete) will respond.The machine just behaves like it has a windows BIOS and won't allow any way to see any of the Mac files.Nor will it accept any HD to try a reload of windows. I've tried replacing the data drive with a spare formatted for NTFS, but the Windows setup file won't proceed far enough to enable this to be tried. Any help. I just want to get back to running OSX again.

Have you tried press and holding the option/alt key while starting up so as to get the startup manager screen. I think you have too many drives attached for Boot Camp to install. Are these on the MacBook Pro you have listed?
https://discussions.apple.com/message/17567891#17567891
https://discussions.apple.com/message/18461537#18461537

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