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February 3rd, 2026 20:57
2-7 blinking lights
I have a Dell XPS 8900. I took it apart and reassembled it and now when I plug in the power supply the power button starts flashing 2 pause then 7 I’ve tried to reseat the ram to no avail.
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ejn63
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February 4th, 2026 01:02
If you have more than one memory module, try one module at a time in each socket until you isolate the bad module -- if one module produces the error in more than one socket, it's bad. If two modules each test bad in one socket but not the other, the mainboard is bad.
Moved from OptiPlex to XPS forum.
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