Have an electric Smith corona sterling from the 60's and the carriage will return when I hit return key but immediately goes back to the left. How do I correct this?

SOURCE: Smith Corona 235 DLE doesn't advance

Does the platen move or does the paper not advance? Check the paper release lever to make sure the feed wheels are snapped in place. If the platen does not move something in the paper feed motor area.

SOURCE: hitting Return just brings the carriage back to

Assuming this is a mechanical machine with elect5ric motor:
Verify the line space selector is not set on 0. (just inside LH platen knob)
Check that the LH platen knob does no have a push lever sticking out to the left.
Try placing a few drops of oil at the left portion of the platen, just left of the metal teeth (the linespace pawl may be jammed and not restoring to rest position)

SOURCE: smith corona sterling floating manual typewriter carriage return does travel all the way to the right

To make things clear are you not able to ON your PCusing the POWER button? or is this a resarting issue?
If POWER button issue please follow as below;
There should be the following issues related:1. Power supply issue2. Power or Reset button issue
-lets take above number 01 firstif it is power supply issue you will need to replace the power supplyby submitting it to a store or dealer.
-if it is number 02 we will need to check it as below:Remove the chasing (remove all screws and cover/ if there are no screwscheck the manual to remove the chasing)
check the cable which connects to your power switch to you PC.Remove this cable (you could see this cable mentioning as 'POWER' printedon the end of the cable which fits to the motherboard)
unplug/remove this cable from your motherboard and then switch on yourpc. See whether this switches the PC automattically. If so, the issueis with the POWER switch. You will need to replce this cable with yoursystem manufacturer. If this is not the case then the problem is withyour powersupply.