Machine freeze every so often. Checked HD and memory. Reformatted HD and reinstall programs. Problem still exist.
Download tune-up utilities and do a disk defragmentation.
Or there might be a problem with the cooling fan, I suggest you open the desktop carefully and verify if that the fan is clean and rotates normally otherwise check if the ram is working well.
1. You might have faulty hardware. Remove all devices that you can
access, such as DVD drive, wireless card, PCMCIA card, USB devices,
etc… Run the laptop without them and test if the laptop still freezes
intermittently. If the laptop works fine without these devices, install
them back one by one until the laptop fails again to find out with
device is causing the problem.
2. Listen for the hard drive sounds. Does it sound normal? May be the
hard drive makes clicking sounds “every 10 seconds or so”, like it’s
trying but cannot access some information on it? You can test the hard
drive with Hitachi DFT test. From my experience this utility work fine
on most laptop drives.
3. It might be a software issue. Make sure that you load correct device
drivers. You also can try this. Install just Windows OS, without any
device drivers. Test if the laptop freezes. If the laptop works fine
without drivers installed, start installing them one by one and test
the laptop after each installed device driver. Find with driver is
causing the problem.
4. This method is more advanced. Boot the laptop from any live Linux
CD, you can use Knoppix and test if you still have the same problem in
Linux. If it works fine in Linux, then most likely there is nothing
wrong with the hardware and your problem is software related. It also
might indicate that you have a faulty hard drive because live Linux
runs from a CD/DVD disk, not from the hard drive.
Does you machine produce any error messages?
One of the programs you installed is probably causing the freezes.
Try to identify any programs that freeze when you try to run them.
Uninstalling the program should help solve the problem.
You can not rule out viruses though
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