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I have an odd issue I'm trying to nail down. I have an old Gateway NV53A with Windows 7 64bit w/service pack 1 - The issue is when the laptop enters sleep mode, with the AC charger plugged in - once the battery is charged to 100% - the AC adapter is no longer recognized as being connected/plugged in and the battery fully discharges until laptop powers off. If waking from sleep mode before the laptop battery fully discharges, the battery taskbar icon now has a red X showing 0% charge and the AC adapter still isn't recognized (plugged in-not charging). This only happens after waking from sleep mode. I have tried a new battery and AC adapter, I've updated BIOS to latest version 2.14, uninstalled/reinstalled - disabled/re-enabled the Microsoft AC adapter and ACPI complient control method battery drivers in device manager, tried different sleep/power settings, tried battery recalibration proceedure - all with no effect. At this point, I'm leaning toward a motherboard issue with the charging circuit not allowing the AC adapter to cycle back on once the laptop is enters sleep mode and the battery charge drops off. Wondering if someone out there has had an issue like this and has found a fix/suggestion to try. Thanks in advance!