In your Service Manual found here
http://www.dell.com/support/troubleshooting/us/en/04/Pr... under the
Manuals and Documentation tab, I could find no mention of CMOS or other reset jumpers.
Here's the course of action I suggest; using your service manual to guide you, open the computer (take the back off) locate the CMOS battery (watch battery thing) remove the battery for 30 seconds and then put it back in. Then plug in your machine (with back cover off) and attempt to start it, see if either or both of your fans are spinning. If either or both are not, they will likely need replacement. If they are spinning then cleaning and possibly a fresh application of thermal compound would seem to be in order