Hi , any on out there who can help asap would be great - we installed a new faucets with side sprayer, everything went well, we turned it on there was water pressure but a but of a leak, so shut the water off, tightened and then turned water back on and then there was no water pressure at all.

It's a home depot glacier bay set.

First, remove the aerator and seed if you have pressure, No?
Then it sounds like you have disturbed some crud built up in your pipe walls and they are clogging the import ports in the cartridge.

Shut the water off and open up the faucet. Remove the cartridge and check and clean the input ports.

Now p0lace a pan over the faucet and turn the water on to flush out the supplies. Reassemble and test. Good luck, Tom

This happened to me. Most likely there is crud in your aerator. Whenever you do pipe work particles are loosened and end up in aerator. You had pressure and then didn't immediately after so that is the problem 9 times out of 10

Isn't that what I just posted above? Do you have anything new to add? Cheers, Tom