Pc is telling me to plug it in when the battery is at 90%

Unplug your UPS from the wall. Disconnect the batteries. Push the on button. LED's may flash. This is how to reset the logic. Connect the batteries and plug back in. Everything should be reset.

This is almost always a bad battery, but occasionally is the charging circuit.
Unfortunately there's no concrete test to tell which is the issue without putting another battery in it.
See if a friend has the same laptop, and ask if you can borrow their battery to do this test.
A repair shop might be able to tell you which is the issue, but as I said, it's about 90-95% certainty that it's the battery.

There's something very wrong with the boot order from your pc: apparently now it's set to boot from network - something that is done only in network servers.  This happens when the BIOS battery (or the BIOS chip itself) start failing - it's time to start saving for a new pc, this motherboard has started to show signs of old age.
Enter the BIOS and set a new order: put the cd first, then the hard disk second and finally disable all the others. Save, exit and it should boot just fine

put a new BPT hose vacum line hose.

Vitally

Each time you remove the batteries you need to reset the channel so the mouse and the device are on the same channel so they can communicate.
I hope this helped.
Good Luck.

Hi there check board for bios reset normally jumpers that have to be shorted,you must also disconnect power plugs from sockets normally 24 pin and 4 pin for about minute,reset bios on board for few seconds
put bios back as it was reconnect power plugs,reboot to get into bios on screen normally hit DEL button or what your screen tells you ,enter cmocs screen change date etc and check all devices are detected then save when your finished and should boot on its own

Your power settings may be set up to inform you at 90% the battery is getting low.

Windows XP
Go to control panel, Performance and Maintaince(only in catigory view), Power Settings click Alarms tab and adjust the sliders to the desired.

Windows Vista
Go to control panel, click change battery settings, find the option selected click the link below it saying Change Plan Settings, click the link change advanced power settings, go to the battery section and adjust the low battery level and critical level.

try a friends battery if that doesnt work then dont buy a battery and sometimes reseting the phone may work like turn the screen to 90 degress and put an earing or pin inside the reset whole

It sounds like the hard drive may be damaged. Have you tried to put it in recovery mode?

Put a paperclip in the reset hole while holding down the play button until you see the screen go to recovery mode. Then try the format option; this will erase all your files but it will tell you if you need a new hard drive.

You may need to open the case to see for any bad contact since this unit has been used for such a long time. Another test to check whether the problem is from the battery by plug the unit with the charger without battery.If the unit is on, then definitely, the problem is from battery and yo just simply replace it. But if it is still not on, then I suggest you do the check as I mentioned in the frst sentence above. Good Luck.