EMachines T6420 - powers up in safe mode only

Restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer

If done properly the user should get to a screen similar to the below screen.

Select the option for Safe mode command prompt only

Windows Advanced Options Menu
Please select an option:

Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt

Enable Boot Logging
Enable VGA mode
Last Known Good Configuration (your most recent settings that worked)
Directory Services Restore Mode (Windows domain controllers only)
Debugging Mode

Start Windows Normally
Reboot
Return to OS Choices Menu

Use the up and down arrow keys to move the highlight to your choice.

select safe mode with command prompt then type in chkdsk/f/r which will scan for and and attempt repair of bad files and bad sectors on hard drive

you should have no input while chkdsk utility is in progress any input might further damage your computer or

Use the System File Checker tool (SFC.exe) to determine which file is causing the issue and then replace the file.

Type the following command and then press ENTER: sfc /scannow The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.


or

Use an external memory device such as a DVD, flash drive or external hard drive to back up the data you need to save from your eMachines computer.

Any data that isn't saved to an external source will be erased when the computer is restored to factory settings.

Remove any discs that are in the optical drive and unplug the computer's peripheral devices, such as an Ethernet cable or scanner.

Do not disconnect the keyboard, mouse or monitor.

Click the Windows "Start" menu and choose "All Programs."

Navigate to "eMachines" and choose "eMachines Recovery Management."

Click the "Restore" tab.

Click "Password Settings" if you have not already set a recovery password.

Type a new password in the text box and click "OK." Click "Restore System to Factory Default."

Type the recovery password and click "OK." Click "Next" to wipe the eMachines computer's hard drive and begin the recovery process.

Select "Finish" and wait for the eMachines computer to restart.

Use the series of installation prompts that appear on the screen to create a new user account for your operating system, set the system date and time, and set up your Internet settings.


hope this helps

restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer then if your mouse works
click start right click on my computer select properties device manager control scroll to mice and pointing devices you might see a yellow question mark? right update driver
hope this helps