OK, I have a Series 3 (OLED) that started going into the dreaded reboot loop. It had one budging cap on the power supply & I figured this was the problem. Since I didn't feel comfortable changing it myself, I pulled the power supply from it & had a local repair shop replace it for under $20. However, when I got it back & installed it, it still was in a reboot loop. I pulled its 250GB stock hard drive and ran the WD extended test on it. It came back clean. I even put this 250GB drive in another identical Series 3 (OLED) unit I have & it worked totally fine. No problems. Now, in order to help isolate the potential problem, I also pulled the 500GB working hard drive from this other working Series 3 (OLED) and put it in the non-working Series 3 (OLED). Still no luck & in a reboot loop. Therefore, I figured it was a power supply issue & there must be another capacitor(s) that needs to be replaced. Instead of pulling it like before, I just kept the power supply in the Series 3 (OLED) this time and just took the whole unit back to my repair shop. Informed them that power supply probably has another bad cap on it that needs to be replaced (even though they all looked visually fine). They just called me and said ALL the caps on the PS checked out OK so it must be something else. So, what else could possibly be wrong here? I am gonna maybe try to pull the power supply from the working unit and put it in the non-working unit and see what happens. However, is there something else that could be causing the reboot loop. I know there is basically only really 3 main components to these things; motherboard, hard drive and power supply so cant imagine what else it could be. I initially get the powering up screen, but it never gets past that (to the 'just a few more minutes' screen) & reboots back into it so this is what also makes me think its the power supply, but any other thoughts?