I cannot boot it gets the three lines of text Blue Red and Yellow
RECOVERY BOOTING
RECOVERY IS NOT SEANDROID ENFORCING
SET WARRANTY BIT : RECOVERY
Then it reboots again and again and again.... pulled battery and every other trick listed on the internet !!!
Well, none of those three items are inherently bad.. The "recovery is not seandroid enforcing" is common when using a custom recovery (like twrp). The "set warranty bit : recovery" is, unless I'm mistaken, just telling Knox that your phone has a "not stock" recovery (i.e. setting Knox to 0x1). That is normal when running a custom recovery.
When it is rebooting, can you hold down the power button to turn off the phone completely? Or does it not register the power button long enough to actually do anything?
When you take the battery out and put it back in, does the phone try to start up right away or do you have to press the power button in order to start it up?
Is that literally the only text you're seeing? I get a full debug screen before that information telling me how I restarted the phone (i.e. hard reset vs. soft reset) and if the reset was caused by an error... I caught a screen shot of it down below (sorry for the picture quality, the Asus TF101 isn't well-known for it's camera quality).
Edit: Added less-potato-quality screenshot (still not great, though).