F4 is a tough one. Here are some things you can try:
1) First and easiest - look in device manager - any errors?
2) Check the ram. To check the ram, download memtest (http://memtest.org/
). Burn it to a cd using a dedicated .iso burning utility (http://www.petri.co.il/how_to_write_iso_files_to_cd.htm
), make sure the cd drive is at the top of the boot order in bios, then boot to the newly created cd and run the utility.
3) Check the oem websites for video, audio and chipset drivers and see if you have the latest. If not, download and install
4) If you have recently updated any of the above drivers and the problem started immediately after, roll back to the previous driver
5) Try a selective startup. Open msconfig and on the General tab choose "selective startup" (uncheck all three items) and reboot. Does the problem still occur? If not, start adding items back to msconfig one or two at a time, rebooting after each change, until the problem reappears and you'll have identified the offending process. This is clearly a time consuming procedure, but it is the best way to determine if some process loading with the system is the cause of your problem.
After you've isolated the cause, do not use msconfig to permanently disable the process. Instead, if it is a service go to START - RUN and type: services.msc (then press enter) and disable the service OR, if it a program, you can download & run a simple app such as Mike Lin's Startup Control Panel (http://www.mlin.net/StartupCPL.shtml
) to enable, disable, or otherwise manage startup programs.
Again, this particular error can be caused by any number of things. Troubleshooting pretty much consists of trial and error. Sorry.