I had a big problem with my gaming machine last month: it failed to boot up. It didn’t even get to the point where the BIOS beeps and starts it’s start-up routine. The power was on, the lights were on, but nothing happened after that.
At first, I thought it was the power supply. So I got another one. I got a Thermaltake Toughpower Grand 750W. This is one impressive power supply! The packaging alone is worth mentioning. Came with a slew of cables, too. Check thess out:

However, the problem persisted. It was not the power supply. Then I started to suspect the motherboard, then the CPU, then the RAM, then all three. Then I noticed that there were three red LEDs on the primary video card, near the corner. I had not seen these before, and a quick search led me to forums where others had experienced similar issues with this video card. There were lots and lots of suggestions on how to fix, but nothing I tried worked.
Finally, I decided to get to the bottom of the issue. I started removing components and trying to boot up again. Turns out the secondary video card was the issue. I don’t know if it’s dead, or if my system suddenly doesn’t like it any more, or what. But without it plugged in, my system boots up just fine. With the secondary video card plugged in, my system is completely dead (lights but nothing else).
More bad news: the new power supply doesn’t fit properly in my clear acrylic case. Warning, this is ugly. I don’t mean the kind of ugly that gives you nightmares. More the kind of ugly that makes you turn your head away and say, “Dang Hawk! Does that thing work?!” Take a gander, if you dare:

Yes, the power supply is outside the case. Yes, the RAID is also outside the case. Yes, my system works well. It’s been running fine for many weeks. I can’t get the power supply in the case due to the length of the screws. How to explain?… ummm…
This clear case is made of acrylic, a type of plastic. It’s not as strong as metal. Therefore, any part of the case which must support weight is made much thicker than it would need to be if it were made of metal. This includes the back, where the power supply mounts up near the top.
The case came with plenty of extra-long screws to accommodate the additional thickness in the acrylic. These extra-long screws work fine for every device I’ve used… up until now. This new power supply has rounded corners. These rounded corners mean the part of the power supply chassis which grabs on to the screw is set back further than normal. To accommodate this extra space, the power supply came with extra-long screws… just like the ones which came with my clear acrylic case.
I have plenty of extra-long screws, but none of them are long enough to bridge the additional space to the power supply chassis and the additional thickness of the clear acrylic case.
Now half my system is inside the case and half my system is outside the case sitting on the shelf. But hey, everything works! And I can save some money on cooling equipment.