|"I had a stand alone video card in the slot..."|
All actual CARDs are "stand alone".
Onboard video - video built into the mboard - IS NOT A CARD !
The term CARD is frequently mis-used. A device adapter is NOT a CARD unless it's on a physical board that plugs into a slot or connector inside the case that's on the mboard. The same applies to other device adapters that are built into the mboard - onboard sound adapters, onboard network adapters, etc., etc.
A PC Card (PCMCIA card) adapter or an ExpressCard adapter for a laptop or netbook IS a CARD because you've plugging into a connector directly connected to the mboard inside the case. Laptops and netbooks sometimes have other removable CARDs inside the case that plug directly into the mboard - a wired or wireless network adapter card or a dial-up modem adapter card; many have a power related card that also has one or more USB ports on it; high end laptops may have a video card, but most laptops DO NOT. .
As I interpret CARD, any device adapter you plug into a USB or firewire port is NOT a CARD.
"..... I had a stand alone video card in the slot for about 1 year, a few days ago I got nothing on my screen at boot up, I took out the video card and hooked up the monitor to the on board, everything worked fine, At this point I thought the video card went bad so I bought a new one and put it on the pcie slot, same result, nothing on the screen, this is why I think the pcie slot went bad."
It is extremely unlikely there is anything wrong with the PCI-E slot's circuits, unless you had a power failure event that damaged them, or you did something yourself that damaged them, such as
- you unplugged or plugged in a PCI-E card without disconnecting the AC power to the case
- you didn't have the card fastened down while the computer was running, and merely plugging in a monitor moved it upward in it's slot - PCI-E cards / slots have contacts that are very close together and the card and PCI-E slot circuits can easily be damaged when that happens.
If you're SURE you didn't do anything that may have caused damage, then this may be your problem when the old and new PCI-E video card will not produce video, yet the onboard video works fine...
Your power supply is defective or does not have enough capacity to handle the power requirements of the video chipset of the card in the PCI-E slot.
Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.
If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should get.
If you need to get a PS with more capacity, you can usually replace it with any decent standard sized standard ATX PS.
Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.
Don't buy an el-cheapo PS.
See response 3 in this:
If your PS did not have enough capacity to handle the the power requirements of the video chipset of the card in the PCI-E slot, the card often works for a while anyway, but the PS is being loaded to 100% or nearly so of it's capacity all the time the computer is running. It probably can't handle being loaded to over 80% of it's capacity continuously, and the PS is eventually damaged and can no longer produce video from the card when it is installed.
Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:
See the part about checking the voltage readings for +3.3v, +5.0v, and +12.0v in the bios
If you find no signs of the PS having been damaged and those voltages are okay, your PS may still be damaged - the only way to rule out the PS for sure is to try out another known good PS that has at least the minimum capacity the video chipset on the card needs. If you have a suitable PS in another computer you own, or if can borrow one from a friend's computer for testing purposes, try connecting that.
A video card's video chipset may fail if it has a fan and heat sink on it, if the fan and heat sink are clogged with dust and lint, or if the fan stops spinning or spins too slowly.
(DO NOT use a vacuum cleaner to clean off dust and lint that's on anything inside the computer case or still installed on the mboard.)
You can test the original PCI-E video card in another mboard on another working computer - if you get video, there's nothing wrong with it.