I have a Dell Inspiron 1100. Don't laugh, it's paid for and works well. Anyway, when the power supply is plugged in I get a crackling sound. Is it something to be concerned with? Please advise. Thanks.
Sounds like a dodgy, cheap PSU. It shouldn't crackle when it's plugged in with the power on at the outlet (although don't make a habit of doing that), nevermind when its sitting plugged in with no interference from you!
My PSU used to crackle once when I switched it on. Long story short: mobo and PSU fried!
Or it might be needing a good thorough cleaning, could be the fan on PSU that has deposited a lot of dust and fibres. I d clean it properly as well and then see if the problem still remains. Other than that PSU replacement is advisory as others have said.