I have a Dell C840 2 ghz laptop running XP Pro which requires a 90 watt power supply . I have one that works fine. My son has a C840 1.1 ghz which uses a 70 watt power supply. He tried plugging his power supply into my machine while Windows was running and it caused a message to appear on my laptop which said that a 70 watt power supply was detected and that the machine would only run in battery optimum mode until a 90 watt power supply was used and to press any key to continue. On pressing a key my machine's monitor went blank and it locked up. I had to hard-power the machine off (held the power button for 5 seconds) then restarted with my 90 watt power supply. The problem is that I continue to get the message on startup, but with an option to press F1 to continue, which it will go ahead and boot up, but my batteries won't charge anymore.
I have completely disassembled the machine (including disconnecting the cmos power supply) and reassembled several times, but I still get the message, and the batteries still won't charge. Once, after following this procedure the machine booted without the message and the battery light was flashing indicating that it was charging. However, after I disconnected and reconnected the power supply, the same old message popped up and the machine locked up after hitting any key.
I suspect that it could be the onboard battery charger, but before I start looking for one I wanted to put it before the experts.
Any suggestions would be helpful.
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There are isues with HP external power supplies - if it is a dv7-3xxx series you require AC
Smart adapter (120 watt) - 100-240VAC input, 50-60Hz, 2.5A - 18.5VDC
output, 6.5A, Pt No 463953-001
for earlier models require AC
Smart power adapter (90 watt) - 100-240VAC input, 47-63Hz - 19.0VDC
output, 4.74A, 90 watts, with power factor correction (PFC) 463955-001 If you are within the warranty period utilize that warranty if not contact HP and see what price a replacement external power pack is.
Minimum System Requirements OS – Windows XP or Windows Vista Processor – 2.8 GHz or faster (XP) or 3.2 GHz or faster* (Vista) Memory – 1.0 GB RAM (XP) or 1.5 GB RAM (Vista) Video Card –256 MB** Hard Drive – 12GB Sound Card – DirectX 9.0c compatible * Supported Processors: Intel Pentium 4 2.8 GHz (3.2 GHz for Vista) or faster, Intel Core 2.0 GHz (2.2 GHz for Vista) or faster, AMD Athlon 2800+ (3200+ for Vista) or faster. ** Supported chipsets: NVIDIA GeForce 6800 GT or greater; ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or greater. Laptop versions of these chipsets may work but are not supported. Integrated chipsets are not supported. Updates to your video and sound card drivers may be required. Recommended System Requirements OS – Windows XP / Vista Processor – Intel Core 2 DUO @ 2.2GHz or AMD Athlon 64 X2 4400+ Memory – 2.0 GB RAM GPU – NVIDIA GeForce 8800 GTS/640 or similar
There are different types of Dell power adapters, some of them put out different amounts of power. While it is possible that the battery is faulty, it is more likely, given your error message that the adaptor is wrong. If you got it from Dell, you can call them and they will exchange it.
As far as which adapter to use, either should work fine. The 90 watt will run cooler. I have seen the 65 watt go up in smoke when being used on a continuous basis. As to the battery not charging, unfortunately, it sounds like you may have a problem with the internal power supply. The orange light is showing that the battery is discharged. If this light doesn't turn green after the laptop has been plugged in for a couple of hours, you are not getting the battery charged. Power the laptop down, remove the battery. Check the contacts on both the battery and laptop battery connector for any foreign material or "Gunk" and for any bent or broken contacts. Hope this helps! R-
If you did a clean install of Windows XP Vista has nothing to do with this problem.
I infrequently have problems with Dell drivers not working but when I do its because I've installed the wrong ones. I have gone down the wrong troubleshooting path several times because the driver said it installed correctly.....
I noticed that when you go to the Inspiron 6400/E1505 download page (http://support.dell.com/support/downloads/index.aspx?) you have the choice of selecting drivers from lots of OS versions including both 32 or 64 bit versions of XP. I would verify that you have the write driver versions and try again.
Another alternative is using the drivers and tools CD that typically comes with a Dell. You can run that and it should have XP drivers. If you don't have the disk you can also try getting the network card running, connect to the Dell site and running their driver ID wizard to ID the drivers you need.
Let us know if you have any other questions and please don?t forget to rate this post.