It "Chirps" From time to time, my 9200 will, well, chirp or beep. Sometimes it'll be about 40F in the house in the morning, first boot, it'll load up into windows and BEEP or CHIRP at me once in a great while. Other times, like tonight, it'll do it fairly constantly. Still other days, it'll do absolutely nothing out of the ordinary at all. All I can localise it down to is the front 1/3 of the case. Otherwise, the system runs like a champ, like it did a year and a half ago when I bought it.

Check to make sure all your bios settings are right if not you have a hardware conflict somewhere

I do not know how old your Dell is but fans will cherp, eventually they will squeak and if not changed will stop being a fan and cause damage due to over heat of chips. Check your power supply fan, some times they run slow if they are going, also the CPU fan needs to turn all the time. Pull the side cover off and what the main chip fan (CPU fan) see if it runs on start up it should and also some boards such as video boards have fans on the chips. I would suspect a random chip is a fan. Not expensive to replace fans, Very expensive to replace boards or CPU..