Poweredge R420 Will not Boot

I am having an issue, I have a Dell Poweredge R420 that will not boot.

Last time it was active a screen came up saying that the Lead Firmware was not working or something similar to that, and now when I try to turn it on, the lights and fans come on, but I get no signal to the monitor or the keyboard and mouse. I cannot access this server, and now it is costing the company I work for a great deal of money.

Your phone support agents do not seem to understand that this is not an issue I can fix over the phone because I cannot access the server to perform any fixes because it is not working to the point where I can make changes within the OS.