I have an HP Compaq nx7400. I've had it for over 3 years now. I've never changed its battery ever since I bought it.
Over the past few weeks, I've been having an unusual problem. Whenever I plug the AC adapter to my laptop, the whole laptop performance - from the second I switch it on - is very slow. The moment I pull the AC adapter from the laptop, it instantly operates at a normal and fast speed again!
I figured that it must have been a problem with the AC adapter (it's had its fair share of use - being swung around and dragged to lectures...). So I ordered another one off Ebay. Today, I got the new adapter and when I plugged it in, the laptop only went on AC power. It worked fine - fast as normal. However, it was not charging - just on AC power. I am starting to question if the adapter was really as "genuine" like it was advertised on eBay. But anyway... after about 4 hours with the new adapter on AC power, it stopped recognizing the battery altogether and alerted me with a Critical Battery sign. Of course, a few minutes later, it went dead on me - the laptop switched off. It was as if I removed the AC adapter myself, only I hadn't. Now, I am trying to plug it in again (the new one), to see if it will be able to power up again and it just won't respond at all.
On the other hand, when I put the old AC adapter, the laptop switches on but doesn't charge. Again, it is extremely slow with the adapter on, and fast when I pull the wire out. Only for a minute or so until it dies on me again...
Could it be that my laptop's battery needs a replacement?
I would be really glad to read any of your suggestions. Thanks for reading.