print only lasts 1-3 seconds

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Hello I have an ANYCUBIC I3 Mega, When I start a print the bed and nozzle heat up fine. The print starts last 1 to 3 seconds and stops. i have tried 5 prints, 3 which have printed before and 2 SD cards. Can you please assist in the trouble shooting?
Thank you

I know it sounds silly, but have you checked the source voltage?

WOW!!! I have the same problem!

I did the following without good results:

  1. SD Card, new
  2. Software update
  3. MOSFET [2]

I am doing prints without heating the bed, using painters tape... it works, but not happy about it

can you print via usb? - could try that to elliminate the SD reader?

May be a thermal protection problem.