On Windows Server 2003: There is no login prompt when the machine boots up, even in safe-mode. Also cannot login remotely via RDP.
Any ideas on how to get around this?
Also, if it is a Dell, try booting to the diagnostics in the BIOS and run the tests before you go running a windows repair. You could also use the Dell install CD to boot from as well.
Could it be that the machine is simply taking a long time to start all its relevant services, perhaps due to failing to connect to network resources (particularly if it is on is domain and can not see the domain controller(s) and waiting for connections to time out? If this is the case then simply leaving it for a while may "solve" the problem, allowing you to login after a time (and once you are logged in check the system logs for messages that might explain the problem).
It sounds like you're having some hardware issues rather than software issues. If you have a bootable CD and can't find your hard drives than you might want to check in your BIOS and see if anything has changed there that would prevent the hard drives from being detected.
If the drives aren't being detected, you might either have a mainboard problem, or you've had a hard drive failure. You're probably going to have to invest some time in this issue to determine the exact cause.
Good luck, and hope this helps some.
Have you tried starting it using the Last Known Good Configuration option from the boot menu (Press F8 at startup)?