2005 prius only starts when negative terminal is disconnected/reconnected

2005 prius only starts when negative terminal is disconnected/reconnected. I recently bought this car with the dead 12 volt battery. Jump started to drive home next morning put new battery it started but all kind of sign lit up VSC, (!), snow flake symbol on the road, big triangle with exclamation mark. I was able to drive the car for 1 hour with very poor gas Milage. Now each time I have to start I have to disconnect the terminal for 10-15 min. I have already replaced the MAF SENSOR, and 12 volt battery. Any help is appreciated. During battery installation My 10mm key accidentally touched the positive terminal as well for a split sec. But warning lights were present before the replacement and the gentleman who sold me the said once battery is replaced lights will go away??? When I replaced the MAF sensor they were gone for brief moment but came back on after 1/2 a block??? Thanks in advance for help.

 

2005 prius only starts when negative terminal is disconnected/reconnected. I recently bought this car with the dead 12 volt battery. Jump started to drive home next morning put new battery it started but all kind of sign lit up VSC, (!), snow flake symbol on the road, big triangle with exclamation mark. I was able to drive the car for 1 hour with very poor gas Milage. Now each time I have to start I have to disconnect the terminal for 10-15 min. I have already replaced the MAF SENSOR, and 12 volt battery. Any help is appreciated. During battery installation My 10mm key accidentally touched the positive terminal as well for a split sec. But warning lights were present before the replacement and the gentleman who sold me the said once battery is replaced lights will go away??? When I replaced the MAF sensor they were gone for brief moment but came back on after 1/2 a block??? Thanks in advance for help.

 

2005 prius only starts when negative terminal is disconnected/reconnected. I recently bought this car with the dead 12 volt battery. Jump started to drive home next morning put new battery it started but all kind of sign lit up VSC, (!), snow flake symbol on the road, big triangle with exclamation mark. I was able to drive the car for 1 hour with very poor gas Milage. Now each time I have to start I have to disconnect the terminal for 10-15 min. I have already replaced the MAF SENSOR, and 12 volt battery. Any help is appreciated. During battery installation My 10mm key accidentally touched the positive terminal as well for a split sec. But warning lights were present before the replacement and the gentleman who sold me the said once battery is replaced lights will go away??? When I replaced the MAF sensor they were gone for brief moment but came back on after 1/2 a block??? Thanks in advance for help.