hot water taps very slow & only mains indicator lights up?

the hot water was working ok without much pressure. Yesterday the mains water supply was off for 24hrs.
I turned the wall socket off. After the supply to the house was reconected by water company i re switched on the wall power boiler switch the hot water tap still runs very slow. Now boiler wont fire up at all. The only light i have have lit up on the control panel is the mains indicator. any ideas please