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1 long and 2 short beep code means your Memory (RAM) has gone bad and needs to be replaced. Your system made a Memory test and the test is a failure (bad memory during memory sizing).
Here's a guide for Beep Codes on your Dimension model: Click Here
1. Go here to download and install the Chipset - Intel driver.
2. Restart the computer.
3. Then go here to download and install the Ethernet driver.
4. Restart again.
You may want to refer to this link for step-by-step guide to replace power supply specifically for Dell C521 Dimension, which I got from Dell Support site.
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