Ok so randomly the other day i turned on my computer but my screen didn't show anything. The light was blinking on and off so i was kinda wondering if it would just pop up or what but it won't no matter what. I haven't had this problem before and i was wondering if anyone knew what to do about it. The monitor's cord is now plugged into the onboard card (which is crap). I took a look inside and stuff looks fine, a little dusty. I took out the card, blew on it to get some dust bunnies off and put it back in.
The specs are as follows:
Dell Dimension 5150
Nvidia 7600 GT PCI-E
Power supply said 305 Watt Max...+3.3V and +5V not to exceed 150W, +12VA and +12VB not to exceed 264W. I dunno if this helps but i figure it could be a power thing. GPUreview says it has a 65W max power draw so i dunno if it could be that.
There are 2 512 MB sticks of RAM in there too if that matters.
Any help would be hugely appreciated. I'd be more than happy to answer any questions that anyone has about this.

Some other things...
It's not a loose cable, trust me.
The fan runs altho the card doesn't output any video
It doesn't make strange noises during startup or any other time really.

This could be a variety of things and some trial and error steps can be taken.

Remove the card and re-seat it. Sometimes even being slightly off in the proper seating can make a difference.

The motherboard probably has only one slot for the card, but if you have another available PCI-E slot, try moving it to another slot (be sure the slot is the same as the one the card is in now). The slot itself may be faulty.

Even though you said it was not a loose cable, check it for a 4th time. Also, if you have another cable switch cables to be sure it is not the cable itself.

If you have access to another monitor, connect it to the computer. It may be a monitor problem.

Ok I removed and replaced the card to no success

I only have one PCI-E slot so thats no go

Its definitely not a loose cable. The screen shows normally when i plug it into the onboard card without me even plugging it in or anything. It shows nothing on the good card even if i jam it in there, wiggle it all over, and screw it tight.

I can't replace the cord because the cord comes from the computer itself, it doesn't attach externally.

And i do not really have access to another monitor now, although at this point im doubting it being the monitor or cables fault because everything works perfectly when plugged into the onboard card.

I dunno where to go from here, hopefully you guys know of a solution?

Well it would appear that your diagnosis points to your video card being FUBARed. I'd suggest you take it to a repair shop to confirm but I'd say it seems likely you'll have to purchase another card ... unless you're willing to put up with the on-board video controller of course.

Aww man im gonna cry... So like even if the fan runs the card is still FUBARed?

And what would cause something like this?

Every piece of electronics dies eventually .... assuming it were to remain in service of course. Most will keep ticking for many years, even decades. But, just like us humans, a few die prematurely. Excessive heat accelerates the probability of failure. Static electricity can fry IC transistors in a split second. Pulling cards in and out can flex the PCB and cause an intermittent connection; so too could a cold solder joint. If it has died, it could have been due to any number of failure modes.

Also, I dunno what you might have paid for the card but keep in mind that higher reliability costs extra. That's because it takes more research and development plus extra test time to prove out a product before it's sold. A significant factor of such costs go towards increased MTBF (mean time before failure) times.

Anyway, I can't tell from here if in fact it is FUBARed. As I say, your best bet is to have a repair shop confirm whether it's toast or that you need to look for some other cause.

Alright thanks for the help.