S48, Welcome to TechIMO!!!
When you start the computer and it is doing the memory count, hit the DEL key to get into the BIOS. On the BIOS main screen, you should have a menu item that says Set Defaults or something similar. Highlight that and press enter, then go to the save and exit bios option and hit enter. Say yes you want to save the changes.
See if that gets it to try and boot. Do you know if the computer had an OS installed already? What are the total specs on the computer such as Processor, memory and CD-ROM?