My Psp Don Crash Pata Pata

i hacked my psp so later on i wanted to change my theme and i did succesfully, but it wasnt enough for me so i went to download a new theme, then i tried to put it in the same place which is the flash0 file in my recovery mode and don't think it was ment to go there i left the recovery mode and all i got was a totally black screen, my recovery mode doesnt come on and when i turn my psp on only the green light comes for 10-18 secs before turning off. please what should i do and i don't have any money to buy a new one. thax in advance.