If it's windows, there's a very good chance it's a virus. Been there done that kinda thing. Try and boot into safe mode by pressing the F8 key repeatedly while the laptop is booting. Then use the arrow keys to select Safe Mode
Use you antivirus/antispyware program (remember only ONE scan at a time) and see if you're infected. Also I recommend getting the software HijackThis
Don't be scared by the sound of the name, it's a diagnostic and removal tool. It can detect recent changes made by malware very easily and provides you with a log file which you can then show to professionals.
There are a lot of free troubleshooting sites available online which can analyze your HijackThis log and give you instruction on which stuff to remove. These are licensed Microsoft professionals. Sites like http://www.bleepingcomputer.com
, there are more but I forgot their addresses.
You can also analyze it yourself and remove stuff you don't recognize ever installing (like I've done a few times). You can crosscheck the CLSID (the numbers in curly brackets) in their CLSID Database
to see if it is safe or malware. It's not recommended as but if you're knowledgeable enough about computers you can do this stuff on your own rather than wait for what sometimes would take days in computer help forums.http://forums.majorgeeks.com/showthread.php?t=38752
Hope that helps.
Do not try and open other programs other than antivirus/antispyware apps in safe mode and see if it still restarts.
If it still restarts immediately, it could be hardware, as chucky said, listen to the beeps. They tell you something:http://en.kioskea.net/faq/sujet-344-how-to-recognize-beep-errors
I'll post it here:
- Very short beep
This problem is linked to your motherboard
Else it can mean that you are facing a problem with your system memory (BIOS AWARD)
- Short beep
- Long beep followed by 3 sequential short beeps.
This issue is linked to your Graphic card configurations
- Short beep followed by three sequential long beeps
You are facing a system memory problem
- Beep- PAUSE- Beep- PAUSE- Two sequential beeps
This error is linked to your CPU
- Three beeps-PAUSE-Three beeps-PAUSE-Four beeps
You have an issue with the video memory
- Three beeps-PAUSE-Four beeps-PAUSE-Beep
This is linked to an error with your Graphic Card
- Four beeps-PAUSE-Three beeps-PAUSE-Beep
You have a system memory problem
- Five short beeps
You are facing a problem with your CPU
- Long constant beeps
It’s a system memory problem
- No beeps
Short, No power, Bad CPU/MB, Loose Peripherals
- Three Long Beeps
- Short constant and high-pitched beeps
The temperature of your CPU is too high
If it is indeed overheating like Pinny said, you will get the above - short, constant, high-pitched beeps.