Hello, I replaced my MB due to loss of power up and video capability. Thought the reflow of the old MB fried the old MB. I have same blasted reboot cycle ongoing with no video. I have tried booting with no memory, 1 memory stick, no HD and all with same reboot cycle. Can anyone tell me if not the GPU issue (new MB), what else can cause this phantom rebooting?? I have been obsessing over this issue for days since I bought the new MB and prior to that trying to reflow the old MB. I am about ready to blow a gasket soon so any help would be appreciated. I have researched possible issues but I keep coming back to GPU and I believe it's something else. HP really out did themselves with this series of laptops. Sure glad I didn't pay for this one but nevertheless I am beyond frustrated. Please help if you can. Much regards.