What should you do when your computer refuses to boot?

Buzz

Ngày cập nhật gần nhất: 15/4/2026

If your computer or laptop won't start up, what will you do? Most users immediately take it to a repair shop and leave it to the technicians. But dear friends, there are many basic errors that prevent you from booting your computer that you can fix yourself. Those are the errors we will share with you in this article.

Error 1: Keyboard Not Found

When disassembling the computer for cleaning or repair, if the user doesn't plug the keyboard tightly, upon starting up the computer, an error message will appear stating 'Keyboard not found' (as shown below). This error often occurs with desktop computers using PS/2 ports and older motherboards.

How to fix: Remove the keyboard cable and firmly plug it into the motherboard. If you still encounter a mouse not found error, check the connection between the keyboard cable and the motherboard for any bends. If there are any, gently straighten them using a small steel rod (or even pliers). Be extremely gentle to avoid breaking the connector.

Error 2: CMOS Battery Depleted

When booting into Windows and receiving a 'CMOS checksum error' message with a prompt to press F1 to continue (to Windows) or F2/Delete to reset the time in BIOS, adjusting the time won't resolve the issue. In this case, it's highly likely that the CMOS battery has died.

How to fix: Simply replace the CMOS battery, and your computer will function normally again. The cost of a CMOS battery is not expensive, ranging from 7 to 15 thousand Vietnamese dong depending on the type.

Error 3: Hard Drive Encounters Bad Sectors

With prolonged use, hard drives are prone to developing bad sectors. If the issue is minor, Windows may still run but with significant slowness and frequent display of “Windows detected a hard disk problem” errors. In severe cases, the system may freeze upon startup.

Resolution: To fix bad sector errors, avoid using software running on the Windows platform. Instead, use HDD Regenerator software on Hirent’s Boot disk to scan and repair the drive.

Error 4: Loose RAM

Without RAM, the CPU cannot function. If the RAM is loose in a desktop, you may hear continuous beeping sounds; for laptops, the keyboard lights may flicker.

Resolution: Simply remove the RAM from its slot, then use a soft cloth or paper to clean both the RAM and the slot before reinserting it.

Here, Mytour has provided solutions to help you when your computer fails to boot. If you've tried all the methods above and still cannot resolve the issue, we advise you to seek warranty or repair services. Additionally, consider exploring how to fix USB recognition issues to expand your knowledge further.

Frequently Asked Questions

What are common reasons why my computer won't start up?

Common reasons include a loose keyboard connection, a depleted CMOS battery, bad sectors on the hard drive, or loose RAM. Many of these issues can be fixed easily without professional help.

How can I fix a 'Keyboard Not Found' error on my computer?

To fix a 'Keyboard Not Found' error, ensure the keyboard cable is securely plugged into the motherboard. If the error persists, check for bends in the cable and straighten them carefully.

What should I do if my computer shows a 'CMOS checksum error' message?

If you see a 'CMOS checksum error' message, it likely indicates a depleted CMOS battery. Replace the battery to resolve the issue, which is typically inexpensive and easy to do.

How can I address bad sectors on my hard drive?

To address bad sectors, avoid using Windows-based software. Instead, utilize HDD Regenerator software on Hirent’s Boot disk for effective scanning and repairing of the hard drive.

What steps should I take if my computer beeps continuously on startup?

Continuous beeping usually indicates a RAM issue. Remove the RAM, clean both the RAM and its slot, and then reinsert it properly to resolve the problem and ensure the CPU can function.

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