|Maybe. Some companies offer a test board to diag it. Plug it into a pci slot and look for diag codes. May or may not help.|
Other ways are to see for any signs at all. Keyboard light sequence, hard drive, and hook up board speaker for beep codes.
There are two posts actually. One is a very basic test then it goes to the longer post test that everyone knows. If the first part fails then it won't post.
Swapping parts like cpu and memory may offer clues.
Line tests are bed of nails the may prove difficult to find unless you are a line tech.
A very skilled tech with an octopus or more advanced huntron might be able to diag it if they had a working board.
Hang up and live.