I have an old server running for my application. I just checked that it has started flashing orange suddenly from blue. Does anyone know what does this mean?
According to the Dell PowerEdge 1650 Systems Installation and Troubleshooting Guide it means there's a problem. It's most likely a harddrive related problem, so I suggest you check the HDD lights (link goes to HDD part of the guide).
If it's a Windows machine yes just install Dell OpenManage, open the webportal and browse to System->Storage->Virtual Disks and it will show you the status of all virtual disks. If it turns out its not the hard drive browse to Systems -> Logs and it will describe why the alert is on.
You can do the same on a unix machine, or there are live versions of open manage you can install on a CD and boot to and read the Dell hardware logs via that.