Computer turns on to blank screen

[letty]

I have an Ispiron 530s desktop (XP Home). When I try to turn on the computer, the CPU fan is very loud and constant. I get no desktop. Both the monitor and the computer on/off button are amber color, no green. What could be the problem? What should I check first?

 

[raybay]

Usually the amber color indicates a power problem... as if your power adapter or cable to the power adapter is broken, or the power socket is damaged.