Packard Bell. I have a store and save. That has worked ok for about a year. The ac adapter has a

Question

I have a store and save. That has worked ok for about a year. The ac adapter has a green flashing light and the store and save has a flashing red light. It is now not being recognised by the computer. i have tried it in another computer but it is no good. any ideas is it the power source or the hard drive itself? Thanks