what is wrong with my vauxhall corsa?

vauxhall corsa02 sometimes will start but immediately stalls flashing tool bar on dash flashes, tried the other key, no different. it is random and sometimes starts even with toolbar flashing. the biggest problem is trying to start it in the morning iit just continous to flash then will start.do you think it is the mobiliser or petrol pump help!!!!!!

maggie
October 2013