Left my car at my parents house Thanksgiving went back 2 days later to get it and will crank but will not start. Have spark and can hear fuel pump running. Green key flashing on dash and also showing all doors and trunk open unless hooked to battery charger seems to have some sort of electrical problem. Checked fuses seemed fine. Brand new battery 2 weeks before issue. Any advice helpful. Thanks!!

 

Obvious question, but are you sure the battery is tight? When new problems arise after replacing something, always look there first.

 

Maybe the engine control computer is acting up?
I remember back about 6 years ago when my 91 accord wouldn't start in hot days even though I had spark and fuel, after a quick google search it turned out it was main relay by the steering column which did the trick (when I replaced it).

Ya it can be hard to know; can be so many things.

Good luck.