|Malware MAY disable AVG or other anti-malware programs but it it rarely causes a computer to reboot. You probably have something else going on.|
What may cause a computer to reboot?
- if it went to a BLACK screen, not a BLUE one before it rebooted
- Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:
If the power supply is not producing enough +12v or +5v, your SATA hard drive requires both of those and it may not be detected if either of those is inadequate.
If there is no +5v, you also have no working USB ports, and your CD or DVD drives cannot work.
- A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
Sometimes under certain circumstances the computer will black screen AND reset the bios to defaults. In some cases that creates a situation where a drive with an operating system on it that booted fine previously does not boot, r because it's no longer the first hard drive listed in the default boot order settings, and/or default settings are not detecting the drive. Check the bios settings to make sure the drive with the operating system on it you want to boot is listed first in the boot order, and that the controller connection the drive is connetected to is set to Auto detect by the method Auto or LBA.
Check your SATA data cables. The connector on each end should "latch" into the socket on the drive and on the mboard, or on the drive controller card - it should not move when you merely brush your hand against it near the socket - if it does, mere vibration can cause a poor connection of it - use another SATA data cable that does "latch", or tape the connector in place.
(There is a slight projection or bump on one side of the outside of the connector that "latches" it into the socket - it's easily broken off or damaged)
Also check the power cable connection to the SATA drive to make sure it's seated and it "latches" too.
- if the computer went to a BLUE screen before it rebooted, that can be caused by a software or a hardware problem.
The mboard bios MUST recognize the hard drive in order for you to be able to test it with the hard manufacturer's or other diagnostic software. If the hard drive is not spinning at all it cannot be recognized - that's a lot more likely to be caused by a failing power supply or a dying mboard than the hard drive actually being faulty.