It was originally installed with Windows 7 64-bit Home Edition, but when Windows 10 64-bit was installed on it, after pressing the POWER button (first start-up after plugging it into the socket) it hums for a few seconds and turns off, and only starts properly the second time. Integrated Sound Card: Realtek ALC662 ATI SB750 - High Definition Audio Controller
Integrated Graphics: ATI Radeon HD 4200 (368 MB) Processor: AMD Phenom(tm) II X2 B55 Processor