This is a sign of a memory failure. You will need to open the case and remove all of the memory.
Remember to ground yourself before starting. To open the case, disconnect all external cables (including the power cord), then lay the machine on it's side with the cover up. Slide and hold the latch on the back, if there is one, then grip the cover at the indents and slide the cover towards the back of the computer.
The memory sticks are held to the motherboard by clips on the ends of stick that need to be pushed away from the stick.
Then reinsert one memory stick. The modules will only fit the slots one way. There is a notch that lines up with the motherboard slot. If it doesn't line up, turn the memory around (pins of cross face into the motherboard). When the memory module is fully seated, the clips should automatically pop to lock into the notches on the ends of the memory stick. Then turn on the computer. If it boots normally, shut down and add another memory stick then restart again. If it gives the error again and you have multiple memory modules, take out the first one and try a different memory stick. (Similarly as you add memory, any stick that causes a problem should be removed until you have tested all of them and only the good memory modules are still in the computer.)
If the machine is under warranty, contact Dell for replacement memory modules. Otherwise, replace them with compatible memory if you want to maintain that amount of memory in the computer (most manufacturer's have a tool to look up the correct memory for a given machine). Memory is sold at most of the computer stores and repair shops, online computer stores as well as directly by some manufacturers. The memory needs to be 400 MHz or 533 MHz unbuffered, non-ECC DDR2 SDRAM (however, Dell often uses propriety RAM so again check the compatibility).
I hope this helps.
Cindy Wells
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