I have placed an extra HDD in my computer because I had received Windows 8 from my dad.
I had connected all the cables, but when I wanted to power on my computer my PC acted normal for 3 seconds but then it shut down.
I have recently placed a new Graphics Card: VGA Sapphire Radeon HD7870 OC 2GB, this is a pretty good card so I was worried that it was broken.
This doesn’t seem to be the case, because I removed the graphics card and the problem still occurs.
I removed my original + new hard disk + dvd writer + all the ram and the problem persists.
My question is: Is the power supply or the motherboard broken?
The most logic explanation for me is that the power supply is broken. The Graphics Card uses a lot of energy already and the new hard disk probably overloaded the power supply.
What is your opinion? What should I replace first?
I hope you can give me some advice, as I use the PC very often.