Dell Vostro 1540 Intel Core i3 CPU M 380 @ 2.53GHz, 4 GB RAM, 500 GB HDD with Microsoft Windows 10 Professional and Microsoft Office 2010 Home & Business.
Vostro 1540 RAM upgrade - Dell Community
Download Center: Dell Vostro 1540 Drivers for Windows 8 64-Bit
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Dell Vostro 1540 Hard Drive Replacement - iFixit Repair Guide
Amazon.com: Genuine Integrated Laptop Motherboard for Dell Vostro 1540 RMRWP with Intel HD Graphics : Electronics