I have a Dell Comapaq dc 7800. It will turn on then turn off. With what I have researched, it’s more than likely the power supply not sending enough volts because of how old it is. Everything is still in the pc, video card, ram, hard drive, etc.. I’m guessing it’s the power supply, but I don’t have the time or parts to bring it back to life. Selling as is for parts or if you want too bring it back to life🤙🏼 Will take offers as well. Check out what else I have as well!!