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RE: Dell Optiplex GX620 SFF no boot, no screen activity

The GX 620 technically only supports DDR2 Non-ECC 533MHz memory. The 800MHz will not work. The 667MHz might work when it downclocks to 533MHz. In your case, it appears that you only have the one 533MHz stick. In testing, a single memory stick should only be installed in DIMM 1 white, closest to the CPU. But we cannot speak to that non-tested 533MHz Kingston. My advice, get the actual Dell OEM memory and retest. Search for the Dell part numbers below =
PJ410 512MB, DDR2, 533M, 64X64, 8, 240, 1RX8
F6761 512MB, DDR2, 533M, 64X64, 8, 240, 1RX8
Y5934 512MB, DDR2, 533M, 64X64, 8, 240, 2RX8

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