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So, 1 year and 340 days ago I bought a desktop computer.
Since then, it has served me well.
But lately, I wanted an upgrade, so I bought a new video card.
I documented myself about the compatibility, and it is okay.

So I opened the case, cleaned up that... dust elemental living inside of it.
Unscrewed the plastic thingie on the outside to unscrew the old video card.
Because of the stupid arrangement of the ports, I had to unscrew the motherboard to unplug it.
So I unscrewed it, removed the old card, put in the new one, moved the motherboard back, screwed it back in, screwed the video card on the holder... thingie, and screwed the plastic thingie back in.
Everything went smoothly, nothing had to be forced in/out.
I connected the external power supply, closed the computer case, put the tower back in it's place and all the cables back in.
When I pressed the power button, the LED turned... some color I can't distinguish. It stayed that way for a second, and then it went off.
I tried a bunch of things, including permuting the external power supply arrangement (1 connection, 2 connections and no connections), with no success.

And here are some of the specifications:
Motherboard manufacturer: Asrock
Processor: AMD Athlon II X2 3.0 GHz
RAM: 2 x 2GB (had only 1 initially, bought the second plate a bit later)
OLD video card: AMD Radeon HD 5450
NEW video card: Gigabyte nVidia GeForce GTX 650 GPU, 1GB GDDR5 128bit PCI-E, Dual-link DVI-Dx2 / HDMI / D-Sub
Power supply: 450W + all the requirements I managed to find on the internet are met (+12V 18A or something)
More specific information is stored... On that computer.

If required, I may open the case again and read the stickers to find more specific information.
I can also provide photos if necessary.

Any ideas? Suggestions? Something? :|

Here's more info:
Motherboard: Asrock N68C-S UCC
Power supply: ATX-450W

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Have you checked if the memory is secured? Maybe you can clear cmos/ reset bios? – Jeff Dec 13 '12 at 22:58
Since you unscrewed (removed?) the motherboard the obvious start is to make sure nothing is shorting. Next check if all cables are plugged in. If that does not work, try the old graphical card (in case a DoA of the new card). – Hennes Dec 14 '12 at 1:34
This time when I booted it up, I've heard 2 beeps... It won't boot with no video card (except the one integrated in the motherboard) or with the old video card... – Vercas Dec 14 '12 at 12:39
Added more information. – Vercas Dec 14 '12 at 12:58
Does the card need additional power? I would suspect it does. – ChrisF Dec 14 '12 at 13:06
up vote 0 down vote accepted

The problem seems to have been the power cord...
Dunno why... My personal suspicion is that the wire gained an increased resistance over time. It's almost 10 years old anyway.

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