Thank you for your question.
I am sorry you are having a problem with the trimmer. It sounds like the engine seized for some reason. To verify this, I recommend removing the spark plug. Then try to pull the rope. If the rope still will not pull out, I recommend removing the clutch. I have found a video that shows the basic steps for removing the clutch. Click
to watch the video. Once you have the clutch removed, see if the starter rope will come out. If you can pull the rope out, the engine is seized. Usually the cost to repair this type of problem exceeds the value of the trimmer. Most of the new trimmers are compatible with the old attachments. Just take one of your attachments to the store with you if you decide to purchase a new trimmer.
Please let me know if you need further assistance.
Thank you for using Manage my life.