I empathize, these mysterious ones bug me.
Several possible problem source, all of which need to be investigated independently.
An overly aggressive overclock (but you're here, you should recognize that one already).
A bad RAM chip
A bad hard disk cable/hard disk drive (especially the drive hosting the paging file).
A BenQ 1620 DVD Burner in master PATA under XP x64. (Your exact symptoms were once caused by this drive, pulled the drive, no problem. The BenQ ran fine in 32bit or other machines, and is still in use, just not in THAT x64 based computer).
Bad graphics card (this is rare, but I've had it happen on an AGP machine...big mystery for weeks, my wife's computer - she was about to toss it over the balcony).
Multiple graphics cards by different vendors (ATI can sometimes argue with nVidia, especially if there's an ATI IGP on board).
Just a few that come to mind.
However, another issue with hanging has to do with turning write cache on or off. Do you have an inventory of very large (500Mbyte and up) files on a drive formatted with default allocation blocks?
If the directory gets fragmented (and if there's enough of this going on, even if its not), small or default allocation blocks are too small to comfortably manage large file operations.
The OS can appear to hang, sometimes for minutes - 30 to 90 even - while it manages the directories. Eventually the mouse freeze, nothing responds - you're tempted to pull the power cord.
If you don't have a UPS, I suggest write cache should be off for safety.
If you turn write cache on, it can help with performance but if there's an OS crash, you can loose all drive contents.
If you do have lots of large files, format with an allocation block of 16 K to 64 K.
Put the OS in it's own partition, formatted with the default block size.
Put the paging file on a separate physical drive if possible.
| CPU | Motherboard | Graphics | RAM |
|---|
| 955 BE @ 3.85 / 1.4375v | Typical 785G | HD4200 / Radeon 4650 | 8 Gbytes |
| Hard Drive | Optical Drive | OS | Monitor |
|---|
| WD/Samsung/Seagate 1.9TBytes | LG/Pioneer/BenQ 1620 | XP x64 | Samsung 24" x 3 |
| Keyboard | Power | Case | Mouse |
|---|
| MS Split (15 Yr Old) | PCP&C 750 | 15 Yr old Enlight | Logitech Laser |
| Mouse Pad |
|---|
| Wood panel |
hide details
| CPU | Motherboard | Graphics | RAM |
|---|
| 955 BE @ 3.85 / 1.4375v | Typical 785G | HD4200 / Radeon 4650 | 8 Gbytes |
| Hard Drive | Optical Drive | OS | Monitor |
|---|
| WD/Samsung/Seagate 1.9TBytes | LG/Pioneer/BenQ 1620 | XP x64 | Samsung 24" x 3 |
| Keyboard | Power | Case | Mouse |
|---|
| MS Split (15 Yr Old) | PCP&C 750 | 15 Yr old Enlight | Logitech Laser |
| Mouse Pad |
|---|
| Wood panel |
hide details