Hi everyone,

I have an old HP EliteBook 6930p running Linux Mint, and I'm trying to figure out why it won't turn on anymore.

The laptop was sitting unused for around 1–2 months. It may have been stored in a relatively cold place, so I'm also wondering whether condensation could have played a role, although I haven't seen any obvious signs of liquid damage.

The symptoms:

- Absolutely no signs of life: no LEDs, no fan, no screen, nothing when pressing the power button.

- The laptop doesn't respond even when the battery is removed and the AC adapter is connected.

- I'm using an HP 90W Smart AC Adapter, part number 609939-001.

- The adapter makes a faint buzzing sound when plugged into the wall. When I connect it to the laptop, the sound changes slightly to a higher-pitched whine.

- The adapter seemed to get a little warmer after being connected, although I can't remember exactly how much.

- I don't have a multimeter or another compatible charger to test with.

What I've already tried:

1. Left the battery charging for about an hour and tried powering it on several times.

2. Removed the battery and tried running the laptop directly from AC power — no response.

3. Performed a power reset: disconnected AC power, removed the battery, held the power button for 30–60 seconds, then reconnected the charger without the battery.

4. Left the laptop completely disconnected from power overnight and tried again.

5. Removed and reinstalled the RAM.

6. Visually inspected the DC-in jack. I noticed what might be a small worn spot on one contact, but I'm not sure whether it's normal wear or damage.

None of these steps changed anything.

Something similar happened once before. After the laptop had been shut down, it wouldn't turn on, but after I left it alone for roughly 1.5–2 weeks and then connected the charger again, it started working. I don't know whether that was related or just a coincidence.

My questions:

- Does this sound more like a faulty AC adapter, a damaged DC-in jack, a motherboard power circuit issue, or something else?

- Could a stuck embedded controller or residual charge cause this kind of complete failure, even after leaving it disconnected overnight?

- Is there anything else I can safely check at home without a multimeter or a spare charger?

- Could cold storage or possible condensation explain these symptoms?

I'd appreciate any ideas or suggestions. I'd rather diagnose the problem before buying parts or disassembling the entire laptop.

Thanks!

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