First off, is your Samsung Galaxy Tab rooted? And if so, which recovery did you flash?
If it is not rooted, you can get into the recovery mode by pressing the home and volume up keys, hold them down together, then power it on.
As far as what to do from here... if I recall correctly, there should be an option to restore to factory defaults. Give that a shot. But also take note of what options are available and post back so that if that option doesn't work, I am reminded of what options there are and what would be the next step.
NOTE: You are probably going to lose any saved information on the tablet during this process.
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