not dispensing but sounds like it wants to

I have had my keriug for 2yrs. I may have in these last two years used my coffee maker 20 times. I turn it on put in the water lift the lid and place pod. Shut the lid and press brew. It warms and then you hear the noise change like it's about to start dispensing coffee and it doesn't pump. I have tried cleaning the needle. I put vinegar in the reservoir and shaking it and l cleaning with vinegar. And it still doesn't work HELP PLEASE