I have an HP Elitebook 8440p with Windows 7 Ultimate, i7 Processor and 8 GB RAM.
For the last couple of days, when I plug-in my laptop for charging, the CPU usage shoots up to 100% and remains there for around 15 minutes. No offending process shows up in Task Manager/Process Explorer but the laptop is practically unusable for that time. The CPU usage becomes normal when I remove the power cord but shoots up again when plugged back. This is happening with different power adapters/wall sockets so it might not be a faulty adapter issue.
Why is this happening and any pointer to resolve this issue?