We have a leaking kitchen sink, turned off the hotwater under the sink for about 5 minutes, now that we turned it back on there is no hot water anywhere, please help

there is no hot water anywhere Throughout the entire house or just the kitchen sink?
Could you furnish more details?
What was leaking and why did you turn the hot water off?
Was the leak fixed before you attempted to turn the hot water back on? Did you disturb or work on anything connected to the hot water supply? Do you have a single handle sink faucet?
Answer my questions and we'll go from there. Cheers, tom