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You will have to remove the LCD Screen to get to two more small screws under the hinge attachments. Then two more screws to release the cover plate that the Touch Pad is mounted to (the entire remaining half of the main cover). Lift it up gently and the CMOS battery is located to the right of the Touch Pad position.
Step 1: All computer systems go through a set of instructions called the Basic Input/Output System (BIOS) when they are turned on. The BIOS checks all of the hardware and software installed on the computer to make sure they are working properly before loading the operating system. You may need to access the BIOS menu periodically to find out the current version of the BIOS you have if there are upgrades available. The command you use to access the BIOS settings on an Emachines computer will vary depending on the specific model you have.
Access the Start menu and click "Shut Down." Select the "Restart" option. Wait for the Emachines logo to appear on the screen as the computer begins booting up again. Press the "Tab" key when the logo appears and see if the computer switches to the BIOS menu. Press the "Escape," "Delete," or "F2" keys if the "Tab" key doesn't take you to the BIOS menu screen. Use the right arrow key to highlight the "Main" entry and press Enter. Scroll down to the heading labeled "BIOS version." Check the long string of numbers and letters under the "BIOS version" heading to locate the current BIOS version your Emachines is using. Press the "F10" key to exit the BIOS menu screen and finish booting up the computer's operating system. Access/Enter Motherboard BIOS http://michaelstevenstech.com/bios_manufacturer.htm
You need to check first if the wireless switch is turn on.If it is on, check the function key for the wireless. Some computers have function key. Sometimes it is combination of fn and f5. Press those keys at the same time and you should see a pop up window and check if the current status is on. If it is on, uninstall/reinstall the wireless driver in device manager. and restart your computer. If this didn't work. You need to do re installation of your operating system.
Changing CPU is a serious change. When your unit was built the processor speed and type were written into the BIOS. When we change the CPU to a different type there is a chance that the BIOS will not recognize it and refuse to boot up. Also Windows was installed with the original CPU and a major change in hardware could mess up Windows.
I did some research and found this model comes with a 2.0-GHz AMD Turion X2 Dual-Core RM-70 CPU and 4GB of RAM. This is not the fastest CPU that can be put in a laptop but a very good one. (faster than mine)
I can guide you through the steps to replace it but my advice is stick with what you have until it breaks and buy a faster laptop. The upgrade won't gain you enough to justify the expense.