[cooliscool]

Yes it is.. a cheap 300W in a system with a GPU that draws more than the AGP slot can dish out is a sure fire recipe for disaster. I wouldn't doubt for a minute that your PSU killed your card.

 

[Lentoman]

Well his dealer said the card is working fine again, not sure if his dealer did something with it?

My brother had a similar problem once with his gfxcard, it wasn't properly seated into the slot, such things can cause alot of trouble. Also, heat makes things expand so sometimes after a computer has been turned off funny stuff can happen when turning it back on, components not making proper contact, fans breaking or not working etc.

It's always a good idea to try and remove the card and put it back in again (perhaps wiggle it around a little), hey, it worked for my brother!

As for the powersupply, it could be a problem too. Too weak output or too low voltage. Depends on how many harddrives, dvd/cd-rom-drives, fans etc you have connected. But really, I would think the powersupply would fry if you overloaded it, or at least a making a fuse go off. If the card still doesn't work when you get it back, you could always try disconnecting some extra stuff like harddrives/cdroms or other cards/peripherals.

Another thing, in theory, rather than staring at the W(att) value, which measures how much power the supply will use/drain when used under full load, you should look at the max possible output in amps (A) per the various voltages (V).

It's all about efficency, you can compare to a lightbulbs that says 40W or 60W where alot is lost in heat. Lightbulbs that doesn't emit heat (like the LED bulbs) is way more efficent, but lightbulb-companies (aswell as the ones providing electricity) would not make that much money because they almost never break, at least not for 10-15 years or so and use only like 1-2W ( http://www.ultraleds.co.uk/default.php?cPath=46&osC ). It can be argued that a little extra heat is good during winter in some places, but they are pretty useless during summer though.

Also, I once had a bad powersupply which didn't output proper voltage 5V output (4.3x something), which caused alot of freezes. If I remember correctly, usually there is a tolerance of +/-10% on most components etc. 10% of 5V is 0.5 meaning it should between 4.5V-5.5V. You can probably check the voltages in your bios or with some other tool. Best would be to measure with a multimeter of course, but can result in bad measurement values if the psu doesn't have a load connected to it.

Feel free to correct me if I'm wrong. xD