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  • Thank you About your question, unfortunately I cannot reach BIOS even with the external monitor because HDMI port starts working after the "second refresh" of the screen (min 0:36 in my extremely low-quality video). Anyway thank you for your help, it is very appreciated!
  • 1) The issue affects the built-in screen only, HDMI port displays all correctly on an external monitor. 2) This is the only sticker I've found on te mobo: 3) CMOS battery works good, I think the problem concerns the built-in screen control unit (if there is one). Waiting for your helpful answer, thank you very much.
  • Thank you for your answer, Laurent. Yes, the laptop has 2x2 GB of RAM (two identical modules). Just tried your tip, but the PC do the same. It works better with one of the modules (I don't need anymore to standby and wake up again) but presents anyway the white horizontal lines. With the other module the problem remains…
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