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I have to assume you are using an USB port. Be aware not all USB ports on a PC can deliver 5 Volt and if they do, it could be the current coming from a port can be insufficient to start the charging ps a modern phone. On an my iPad there is even a message like can't charge from computer as soon as I connect to the PC.
Try an external charger or perhaps just another USB port on the same computer.
There are a few things to check. The LED lights can tell you a lot. This will tell you more about the battery:
On the taskbar, double-click the power cord icon or battery icon to open the Power Meter dialog box.
Note: If the power cord icon or battery icon does not appear on the taskbar, click the show hidden icons button.
Press Fn+STATUS to view the power status box, which opens
in the upper-left corner of the screen. The power status box shows the
current power source, the battery charge level, and the power management
Look at the battery charge indicator (if applicable).
LED green - Battery is fully charged.
LED orange - Battery is charging.
LED blinking red - Battery charge is very low.
LED solid red - Battery is malfunctioning.
Note: This LED only lights up when the notebook is connected to AC power.
Press the battery meter button on the battery. The battery meter lights indicate the percentage of battery charge remaining.
Wait for a Low Battery warning message to appear.
If your battery charge indicator displays what looks like an inaccurate charge, you may need to recalibrate the battery.
To recalibrate the battery as mentioned, try this:
Connect the AC adapter and then turn on the notebook.
As soon as it starts and you see a startup screen, press the F2 key.
In the BIOS Setup utility, use the TAB key to select the Advanced menu.
On the Advanced menu, select Battery Auto Learning, and then press the SPACEBAR to select Enabled.
Use the RIGHT ARROW key to select the Exit menu. On the Exit menu select Exit Saving Changes, and then press ENTER.
At the Setup Confirmation prompt, select Yes, and then press ENTER.
The battery recalibration process begins and a screen opens showing you the progress.
When the recalibration has finished, and the message "Press [Esc] key to exit" appears, press Esc. The battery charge indicator now displays an accurate battery charge.
This is a common problem with these players (first link). My MP860 failed in this way (insufficient voltage etc message)
I made a rig with laboratory PSU (several amp output) connected to USB socket and I know that that the problem has nothing to do with voltage (voltage was stable 5V - tested also higher up to 5.5V)
For a while a trick with holding the volume up button worked for me. (see second link) But once I discharged the battery to a too low level and the trick did not work anymore.
My conclusion is that that message indicates Li-ion battery degradation and charger circuit/FW declines to charge it showing misleading message. (battery made by Foxlink)
I tore my the player open and rigged charge circuit and get it working again.
1. Never allow the battery to be fully discharged. Charge at any opportunity you have.
2. Once you get the Insufficient input voltage message try trick with holding volume adjustment.
3. If 1., 2. failed rip it open and make charging circuit or replace battery.
4. Do not buy Transcend MP3 players. (?)
1. Check your power cable to ensure that it is 100 percent on both ends any fraying will cause this error
2. Change the power outlet and insufficient power will cause this error
3. Clean out all the old hair and ensure that NO rust exists, this will cause lots of errors
4. Replace the charging cable as the old one may be defective
First, you need to make sure your power adapter is providing enough
power to both run the laptop & charge the battery. A very good way
to do this is to compare your laptop voltage & ampere requirements
(written on a sticker on the bottom of the laptop) with the voltage
& ampere ratings of the power adapter. Voltages should be the same,
or the power adapter's voltage about up to 0.5 volts more than the
laptop's voltage rating. Amperage of the power adapter should be at
least equal to or greater than the laptop's rating. It should never be
less than the laptop's rating, or else the power adapter will be
providing insufficient amperes to charge the battery. Of course, the
power adapter's nominal amperage might be ok, but it degraded on usage.
You can verify this by testing using a good or new power adapter. If
the battery did not charge using the new power adapter, take the battery
off the laptop, & using a dry tooth brush, scrub in between the
fins of the battery connector on the motherboard & on the battery it
self, then put the battery back into the laptop & try again. If
this still did not resolve the problem, then the battery itself could be
bad. Try it on another laptop, or try a good or new battery in your
laptop. If this did not work, there might be a possibility that the
charging circuitry on the laptop's motherboard is defective & needs
servicing. In order to do this, the laptop needs to be disassembled
& the motherboard checked for defective/burned out components in the
area near the DC jack. Any defective/burned out components found should
be replaced, or you might need to replace the laptop's motherboard
Whats the spec of your power supply (approx 19v dc @ 3 - 4 Amps...)
Voltage 'OFF LOAD' is irrelevant - its the power consumption (A) that you need to validate (Do not measure directly)
Does the Laptop power up under mains feed ?
Is your concern mainly the fact that the battery(s) are not charging ?
Rechage it using a mains adapter. Then continue with the instructions.
If you try to charge it using a PC you MUST use one of the USB ports on the rear of the machine - a powered USB2.0 port. It is also a good idea to just leave it pugged in even if it has the red X displayed. It should still charge even though it doesnt show it is.