![]() If you're still facing this trouble, you may try the following steps: 1. Or did you make any software change (Windows re-installation, etc.) in the unit? Would also like to know if you've tried updating Windows, as suggested by 'maxie'. Please share if any part (Motherboard, Hard Drive, etc) was replaced on the notebook recently. 'PCI serial port driver error' points at a Chipset driver. ![]() Mobile Intel(R) 4 Series Chipset PCI Express Root Port - 2A41. Microsoft Surface ACPI-Compliant Control Method Battery. Downnload Dell Latitude E6400 laptop drivers or install DriverPack Solution software for driver update. After the board was replace, the power on worked fine. I had the systemboard replaced due to my laptop not powering on off of a fully charged battery. Now it can't find the PCI Simple Communications Controller and PCI Serial Port drivers for 64-bit vista.
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