When I turn on my Singer Stylist 7258, the stitch indicator shows a i"backwards C forwards C", not 00. I cannot get it to change to a stitch. Ideas? Turning it off & back on did not resolve it.

SOURCE: Hand wheel will turn backwards, but not forward

here is some troubleshooting
Download your manual.
manual
http://safemanuals.com/user-guide-instructions-owner-manual/SINGER/3116-_M

Ok I know that youve checked this, but I have to ask.
Pg 39
Check and make sure the reverse lever isnt engaged.

I'm looking at pg 27 and see you have a traditional bobbin casing (not a drop in) make sure your bobbin is wound well and the case is inserted correctly. (they are picky)
Change your needle make sure its in right and tight. (I have bent many a needle just slightly, and it causes huge issues with this particular type of bobbin casing)
Pg 35 gives a test for the bobbin tension. If your thread rolls, the tension is too loose, OR the case may have gotten damaged.

Lets see if this helped.
Good luck

SOURCE: singer stylist sewing machine 534 is not stitching

Feed dog drive gear(2) are plastic and are probably stripped. Always replace them in pairs. While you are at it replace both hook drive gears as well. It will run as good as new.

SOURCE: My new Singer Stylist 7258 keeps getting a message

I looked in my manual, it says that C4 means that the thread is tangled or there bobbin was interrupted forcibly. Turn off and totally rethread your machine with presser foot up, insert a new needle and try again. Do this test, with the presser foot up, pull top thread, it should move easily, now lower presser foot, pull thread, it should barely move. This should seat the thread in the tension discs properly. I have this same machine, and love it.

SOURCE: I have a singer 7258

Hello

Adjust the tension

Load your sewing machine with one color on top, threaded through the needle. Load the second color thread into the bobbin and thread.


Fold the scrap fabric in half, and sew a straight stitch at least 2 inches long. Look closely at the seam. If you see loops of the bottom color thread on top of the fabric, proceed to Step 3. If you see loops of the top color thread on the bottom of the fabric, proceed to step 4.


Loosen the top tension. Since the top tension is so tight, it is pulling the bottom thread up through the fabric. Loosen the top tension by turning the numbered knob on the front of the sewing machine counterclockwise by one number.


Tighten the top tension. Since the top tension is too loose, the bottom thread is pulling the top thread down through the fabric. Tighten the top tension by turning the numbered knob on the front of the sewing machine clockwise by one number.


Sew a straight stitch 3 inches in length. Check the stitching. It is perfect if the threads meet in the middle, and you can only see the top thread on top and the bottom thread on bottom. If it still needs adjusting, go back to step 2 to repeat the needed steps.


Using two different colored threads makes it easier for you to see which thread is being pulled.

Always use proper precautions when working with electrical machines.

SOURCE: Singer stylist 7258, will only pick up bobbin on one side when doing zigzag stitch

try using a washable stablizer or interfacing.
if that doesn't help then it's possible that a gear or cam may be worn enough to cause the machine zig zag not to work properly