I successfully put together a PC using the following components roughly two years ago (excluding the hard/optical drives, as they're unlikely to be the culprit):
ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGIBOX
Patriot 2GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model PSD32G13332
XION II XON-102 Silver Steel ATX Mid Tower Computer Case 450W Power Supply
BFG Tech NVIDIA Geforce 9600 GT Video Card
This system worked fine until roughly two months ago, when the tower was dropped while being transported. The front-panel connectors were ripped in half, so I purchased a new chassis:
Antec Sonata III 500W Quiet Super Mid Tower ATX Case (Black)
After connecting all the components in the new chassis and turning the system on, the motherboard successfully received power and lit up its LEDs. Both the CPU and GPU fans activated. However, the monitor received no video signal. This problem recurred after checking all installations and retesting on a different monitor and DVI cable. At this point, the video card seemed the most likely issue, and I had planned on replacing it soon anyway, so I purchased:
ASUS EAH6950 DCII/2DI4S/1GD5 - AMD Radeon HD 6950 - GDDR5 1 GB Video Card
After replacing the old card with the new, I still received the same issue: mobo, CPU, and GPU receiving power, but no video signal. I've since learned that my power supply is inadequate to power the video card: it requires at least 650W. This provided some relief, as I thought I had identified the problem, but I then realized that I had the same problem with the old video card, which had received adequate power from both the 450W and 500W power supplies. At this point, I know I need to upgrade my power supply to at least 650W, but this is apparently not the only problem keeping the monitor from receiving video signal. After spending much time and money in repairing this machine, I've become frustrated and shelved it for quite some time.
My main problem is in diagnosis. My only means of testing individual parts is to purchase new ones and test them in the system, at which point I've obviously sunk more money. If anyone has any ideas as to what the defective component is (above and beyond the insufficient wattage on the power supply), I'm dying to hear a theory. Also, if anyone knows of any means to test my other components before purchasing new ones, it would be enormously helpful.
ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGIBOX
Patriot 2GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model PSD32G13332
XION II XON-102 Silver Steel ATX Mid Tower Computer Case 450W Power Supply
BFG Tech NVIDIA Geforce 9600 GT Video Card
This system worked fine until roughly two months ago, when the tower was dropped while being transported. The front-panel connectors were ripped in half, so I purchased a new chassis:
Antec Sonata III 500W Quiet Super Mid Tower ATX Case (Black)
After connecting all the components in the new chassis and turning the system on, the motherboard successfully received power and lit up its LEDs. Both the CPU and GPU fans activated. However, the monitor received no video signal. This problem recurred after checking all installations and retesting on a different monitor and DVI cable. At this point, the video card seemed the most likely issue, and I had planned on replacing it soon anyway, so I purchased:
ASUS EAH6950 DCII/2DI4S/1GD5 - AMD Radeon HD 6950 - GDDR5 1 GB Video Card
After replacing the old card with the new, I still received the same issue: mobo, CPU, and GPU receiving power, but no video signal. I've since learned that my power supply is inadequate to power the video card: it requires at least 650W. This provided some relief, as I thought I had identified the problem, but I then realized that I had the same problem with the old video card, which had received adequate power from both the 450W and 500W power supplies. At this point, I know I need to upgrade my power supply to at least 650W, but this is apparently not the only problem keeping the monitor from receiving video signal. After spending much time and money in repairing this machine, I've become frustrated and shelved it for quite some time.
My main problem is in diagnosis. My only means of testing individual parts is to purchase new ones and test them in the system, at which point I've obviously sunk more money. If anyone has any ideas as to what the defective component is (above and beyond the insufficient wattage on the power supply), I'm dying to hear a theory. Also, if anyone knows of any means to test my other components before purchasing new ones, it would be enormously helpful.