A couple of questions

[Evert_Claesson]

I got a couple of questions...
I noticed when I print from an SD card the printer will start up right away and try to print without heating the hot end first. When I first got my Printrbot Play a couple of months ago I would print using Simplify 3d with the USB connection and when I issued the print command the printer would always head the bed first, then the hot end and only then would it begin printing. Now maybe this is normal behavior when printing from an SD card. I guess I was making the assumption that all print commands (hot end\bed temps, print speed, layer heights were stored in the Gcode and when executed would override the settings in the firmware. Perhaps my assumption is bogus...?
Right now my heated bed still isn't working so I've been printing with PLA Plus (which I discovered recently and am liking a lot). I'm wondering if I have a bad MOSFET. If so which one supplies power to the heated bed? I also discovered when attempting to hook up a cooling fan that my D9 output has no power. Could that be somehow related to the problems I'm having with the heated bed? Thanks.

[Walter]

Could you check if the statements to set the temperature are included in a g-code file you use ?
Look for these using notepad++ or just notepad to look into the file. They should be in the beginning after the comments S3D inserts.

M140 S110
M190 S110
M104 S250 T0
M109 S250 T0

Where M140 and M190 are for the bed and M104, M109 are for the extruder.
Sxxx is temperature.

I think from the behaviour you mention, that the M109 and M190 commands aren't there.
These are used to set the temperature and then wait until setpoint is reached before continuing.
Possible (only) cause in S3D unchecked box here :