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I have a Compaq Deskpro EN and I am getting one long beep and two short beeps on bootup, the caps lock light is flashing and no video. The case has a sticker which says this means "no video." But what video? There is no graphics card, at best there is a 2D accelerator integrated in the chipset somehow.

Any tips on how to go about fixing this would be appreciated.

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Ah, I've solved my problem: the RAM wasn't seated properly. Maybe the memory is used by the onboard graphics, but it works properly now. – Thomas O Oct 26 '10 at 9:26

From what I see on this website, it does appear that you are correct about what the beep code means. In any computer, there is always a video card, there has to be, and like any other component, it can fail. In this case, it appears it did fail. It does appear to be integrated. It also appears it has an AGP slot, so you can buy an AGP video card to use in the system in place of the integrated card.

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It doesn't have a video card. There is a point where a video chip can be soldered to it which connects to the internal AGP bus, but there is no slot with it. – Thomas O Oct 26 '10 at 9:12

1-long 2-short is pretty widely known as a problem with video. This can mean that the monitor cable has come loose (not everything can run headless), or that the on-motherboard graphics chip has smoked itself. If it isn't simply the monitor cable, fixing this will require putting a separate graphics card in the machine.

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