Failing video card? Or a logic board problem?

Re: video card failure?

It is a follow-up to a previous debate.  Less than 2 years ago, I had a default videocard from apple (OEM) with lines of scratches on the screen.  I replaced it with a

ATI Radeon HD 4870 Graphics Upgrade Kit for Mac Pro Apple sold by: JAG technology it worked fine until I have let my old Mac 2008 for 9 months. When I turned it on to use for art, the startup has been slow and the screen became often black or never turned on at all. And the map seemed to be running really hot.    I pulled the card according to the suggestions and started and checked start with Hello time and on screen sharing my network and it seemed to have a time of normal start for this computer. But when doing screen sharing the screen remains black. So, I can see the contents of the hard drive, etc., but there is no display.

I ran TechTool Pro and all components on the Mac pass inspection including the video ram.    I wonder if the problem is a graphics processor integrated on the system board itself or just the graphics card.    If the chip card display does not work, shouldn't be able to see a display from a distance even in the absence of a graphics card? Or not?   I don't want to pay $150 to replace a card if it is bad.

Thank you for your help.

The f

There is no piece of the display on the map. For video, you need a working video card.

Try reinstalling on both ends of the cables of two power between the card and power on the logic board UAX connectors.

Check that the fan turns freely

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