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Question: Issues with USB and Power on probook 4510s

I have problems with my Probook 4510s:
1.It doesn't detect the USB unless I reboot
2.It switches off itself and I have to wait for 5 to 10 minutes to turn it back on. A blue light comes up at the power connection and until it turns orange, I can not restart the laptop (with or without the battery)....
I need some inputs on these issues