Computer case without built-in speaker, how to do diagnosis?

[Tubbychubby]

I have a computer case by Raidmax (Sagitta), I noticed that it doesn't have cables that can plug into motherboard's "speaker" pins. I doubt it has internal speaker that can gives out beeping sound to do internal diagnostic test. With a computer case like this, how am I supposed to tell what went wrong with my computer (whether it is DRAM error, power error, HDD error..etc.)?

 

[Cinders]

Add a speaker and wires to the pins.

 

[mailpup]

You can buy an internal speaker separately if it didn't come with the case. Some cases come with a little speaker that looks like this: Click here
Maybe yours did but you didn't recognize it as a speaker. Anyway, you can buy this type or the traditional cone speaker.