How can I tell if replacement LCD is "good"?

Hi everyone
I bought a used 20" Intel iMac that supposedly only needed a hard drive and a new LCD panel in order to work. The hard drive was easily installed. I ordered a replacement panel off eBay and installed it, but I'm seeing a grey screen with lots of tiny black rectangles on it. I figured that maybe there's a problem with the video card, so I scrounged up a Mini-DVI to DVI adapter, and connected an external monitor. However, nothing ever displays on that external monitor. If there is truly a problem with the video card (the logic board?), I'm going to stop buying parts and sell the carcass....
Anyway, how can I tell if the replacement LCD is good? Does the weird pattern I'm seeing on the display indicate a problem with the panel or with the video card? And shouldnt the iMac automatically output to the external display when I connect it via the adapter?
Thanks!

Hello, does it sound like it's booting up at all?
If we could get it to boot, we could take a screen grab & that would tell us, if the screen capture was indentical to wahat you're seeing then it'd be the graphic card, since it captures it from the card/VRAM, not the screen actually.
As far as the adapter I think you have to have it at least booted up part way for a second monitor to even light up, not positive though.

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Follow us on Twitter @VZWSUPPORT

How can I tell if replacement LCD is "good"?

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