Considering the age of a 530 it may just be stuck. Here is the Dell service manual.  Page 165 details removing the CPU cooler assembly [URL]
How do I remove the fan cable from the motherboard. Just pull it out? Is there a trick to it? It seems pretty firmly set in place. I don't know how much force to use (didn't want to use too much and break something).
Inspiron 530 - removing the fan/heatsink