Did you use a brand new CMOS battery that you purchased or one that you had sitting around? Also which cable did you unplug and then "put it back"? Make sure the CMOS battery is secure in the holder and is right side up (you should see the + on the battery facing up). Also when you replaced the battery did you leave the battery out of the holder for 15 minutes before inserting the new battery? Of course since the system worked fine before you cleaned it out then the possibility exists that you could have affected the MB such as a loose RAM module, a short on the MB, or bent the CMOS battery holder contacts.
My inspiron 15-7560 laptop cannot be turn on. When I plug-in the power and hit the power button, battery light and power light on. Then battery light shows 3 yellow and 1 white. After this pattern goes on for around 7 times, battery light and power light turn off. Then, I can’t turn on the laptop.- Hit the power button -> no light- take out the power cable and plug-in again -> the battery light on for 1 seconds and off again without power light. If a take out the battery, power and hold 30 seconds the power button and put all again, the battery light show me 3 yellow and 1 white again once. Then the laptop remain the same as before. Since 3 yellow 1 white is about CMSO battery, I have already replace the battery but remain no different.My power adapter, power jack is all right. My CMSO battery is good. My battery is very old and can’t be charge for using a long period. The laptop did not have any problem yesterday, it has the problem today after I clean the dust and unplug cable and put it back.
Inspiron 15 7560 3 amber 1 white and cannot turn on even unplug CMSO battery