dude stop spreading misinformation. No need to power the card. resistance measuring done with power off.
I know how to use a multimeter thank you, resistance testing doesn't mean anything, you are basically looking for a short and that means nothing in the end if you don't know what the components you are testing do, example a diode. I don't spread misinformation thank you. You guys expect people to be electrical engineers ... I know how to test to board level and understand what the components do and what to test for. There is also a point when you need to test the rail voltages, with power on too if you don't find an obvious short or a rail thats failed or giving the wrong voltages (which means you need to know the correct voltages first that you are testing for!). People like you that spread rubbish information that you forget can also cause more harm to the card if not done right. Not worth the risks for a user that doesn't understand what they are testing for. He clearly has made that clear.
Now coming back to resistance testing, you think resistance testing an IC without knowing the specs of it and what the pins should output is correct ? Even a faulty IC can give you a resistance on pins tested that are faulty doesn't mean it's working correctly. It is a solid state device you can't see in and not a component that is a single simple component to test, like a capacitor, diode, inductor, resistor, transistor, fuse etc that can easily be tested and seen as a single component, an IC has millions of components inside it and if it doesn't show a clear sign of damage you can't tell if it's working without knowing what the pins do and what to test for and the output you expect, some cases you need an oscilloscope or a full suit of electronic test equipment for the digital and analogue parts of the circuit, multimeter is not enough for these types of tests and on ICs you are guessing unless there is one blown to bits or looks damaged and then you have to have equipment to replace them and the correct components to replace them with, so you think someone that is going to borrow a multimeter has a soldering station and all the equipment to remove surface mount components and stick them back on correctly ?
Are you going to help him test the board and with pictures where to test or are you just typing rubbish and not willing to help further than saying use a multimeter ? A multimeter is a tool you need to understand how to use and then understand what you are testing for.
Some of the C**P on here recently sounds like its coming from people watching youtube and then an expert .. Give it a rest the guy is wanting to fix his card not cause more obvious damage.