My computer does not start; if it is switched several times than it shows Serial Presence Detect (SPD) device data missing or inconclusive error where as I have four 512 DDR Rams installed some time ago
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This sounds like a SPD detection error and I _think_ that is usally to do with memory setting detection.
Try the memory/chip configuration on your BIOS and see if it is set to BY SPD. If it is, it usually should work but your mem may not support it.
After unplugging your computer, try snapping each RAM module in and out 4 or 5 times to burnish the contacts. If that doesn’t solve the problem then try removing all the modules and installing one at a time, in the first slot, to determine which one may be defective.