I was able to look inside, didn't see anything disconnected, loose or burnt up. The additional cable coming off the power supply is for additional drives correct? The computer is a Dell dimension 521. So I cleaned up any dust and reconnected the power cord. It started up like it was going to boot up, I thought I was set, and then it stopped, and the orange light began flashing again. Does this help tell if it's the power supply or motherboard? If it's the power supply, how do you know which ones are compatible? I have a few extra computers around. Otherwise I should disconnect and reconnect the large cable? And change the battery? If nothing fixes it then, then it's the motherboard? And finally, if it is the motherboard, is it worth replacing on a computer this old? Or can I figure out what newer, faster motherboards would work as replacements? Probably getting ahead of myself, sorry for the slow response, I wasn't getting notifications. Thanks