Thanks. What is a good online source for purchasing a new drive cable?There should be a clamping bolt on the gear box on the lower end of the shaft. If you loosen it, you should be able to pull the gear box off. You can then pull out the flexible drive cable and have a look at it. If the either end is rounded off, it can slip and the head may turn, but will slip and not spin up to speed. This is also a possibility if one end of the outer shaft is not fully engaged and the cable is slipping out of the drive.
If the drive shaft is the issue, it's not a difficult repair.
Thanks. One last question. How do I get this trimmer head off?There are (2) different drive cables for your model trimmer. You need to look at the illustration and determine which one you need.
Either the 530094585 or the 530095795
There are many online sources for parts, or your local lawn mower shop can probably order one for you as well.
google poulan weedeater parts, or just google the part numbers. They are also available from Sears Parts Direct.