I have a Dell latitude E6430 that will get stuck at the bios/Dell welcome screen when started after being off for more than about 10 minutes. Also, when I remove the power charger and battery, then reattach, same thing. Yet, when I shut it off then restart it again, or if restarting out of OS, no problems. The bios is updated, even tried default settings. Everything passes Dell diagnostics test and no problems showing in event viewer. Tried both 6-cell and 9-cell battery and a 90w and 130w chargers for giggles and grins. Recently upgraded to a i-7 quad processor, no change. No change whether secure boot is on or off, legacy or uefi mode. Hoping it's not the mobo. Anybody experience this problem? Please point me in the right direction. Specs: Intel core i-7 3632QM cpu, 8gb 1600mhz memory, Intel HD 4000 and Nvidia NVS 5200M graphics, 128gb SSD primary and 1TB HD secondary hard drives, Dual OS-Windows 10 pro and Backbox 4.4(ubuntu 14.10 based).