YES! i really think you should go for one of these:
POST Diagnostic Card
These are great for general fault finding, what it basically does is plug into a computers spare PCI slot, and reads the codes that the computers BIOS puts out when booting up, called a Power-On Self-Test, and can diagnose problems such as RAM that isnt installed/working or no CPU installed/working and can tell if there is a problem with any of the motherboards on board components.
The codes are displayed on two or four LED displays (depending on the model) and you can find out what the codes mean in a handbook you get with them. They work normally with the most popular BIOS models.