PowerEdge 1750 with a warning red light blinking!!!

Hello to all,
I have a PowerEdge 1750 with a warning red light blinking, I running a diagnostic scan but I don’t know if that is sufficient enough to determine the cause of it. This is my first time using the Dell PowerEdge “Service & Diagnostic Utilities disk” as a diagnostic tool, if someone knows a better way to find why the warning is blinking, could you please reply to my cry of help???
Thanks in advance for your input,
Alex