2004 prius wont start

Ok so i bought a 2004 prius with 82k miles o drove it home used it for a week got every light in the world on i did tons of research checked the 12v battery charged it and used 2 other batteries to see if it would start but didnt a week later i put the fully charged 12v battery in and it started with no issue used it a week and it did it again only when i tried and did the same thing again mdf and the combination cluster is blank except the seat bell sign and car beeps when u open the door like its it but wont drive ive inserted the key and try to start it but a check engine light appears quickly and disappears ive tried everything on youtube even fixed a trunk water leak i i found but not on the battery opposite side ive unplugged harnesse checked ground on battery all fuses etc oil was over filled by toyota but i corrected it im out of ideas now and i dont think its a HV battery issue because the battery didnt discharge after sitting a week when i couldnt start it and when it was started it got charged back up im lost now i have bought a code reader but havent received it yet

 

Sucks cause i have a rsx type s with 500 whp this is suppose to be a work car never had a toyota but this just sucks

 

I tried 3 diffrent 12v batteries which all were tested and worked wasnt the issue

I do food delivery i cant do that in a race car and i was thinking my rsx is 18 years old ran hard and never gave me a issue expected the same from the reliable toyota

Code reader will come in today i will clean the MAF also but can the MAF cause the car to not start attached is a youtube link of the issue but my check engine light comes on for a second and disappear

 

So i found out the check engine light and nothing on the screen was a relay that was wiggling under the hood seems to have reset the ecu i did get the code reader but custom pids arent working for some reason on torque pro and codes havent appeared again yet