HP 505B locking up and kicking out a frozen white screen. Hard reboot seems to fix it for awhile

So I have an HP 505B running in our office with Windows 7 Pro 32bit, intergrated nvidia graphics, and 4gbs of memory. Product number VS882UT.
It will randomly hard lock and display a white screen on the monitor. I have tried reseating all cables, replaced the monitor with a known good ( when the issue happens...still no go), replaced cables, updated the graphics drivers and also the bios. checked event logs for major errors (other than the hard shutdown event after coming back up...not much else is listed).I've also ran the onboard diags and they come back as passing. plus i've ran my own memtests over an extended period of time.
The issue doesn't happen all the time, I could go 2 weeks without an issue. No particular program ever seems to cause the issue. I have opened and cleaned all the fans and they all seem to be functioning normally. I have also reseated memory and reinstalled the OS from the factory partition.
I've ran into this issue in the past with another 505b, went through all the steps above contacted tech support and eventually had the motherboard replaced. Sounds like a good fix....it wasn't the last desktop ended up doing the same thing a month or so out. I'm running out of options to try other than going with another manufacturer. I have a lot of these desktops and i'm afraid at some point it's going to happen to all of them. Hoping maybe someone out there has had this issue as well and can recommend a permanent fix.

I'm IT support at a law firm and we have ... I don't know...at least 20 505B desktops. I think they came with Windows 7 and we downgraded them to XP.
In the past 2 months, I've had at least 5 or 6 of them all start having this issue! Its like someone set off a time bomb!
The only fix thus far has been to order a standalone PCI video card and disable the onboard video.
I've tried updating the drivers from both HP's website and the Nvidia website, which does not help.
I really do not like having to keep buying new video cards for a computer that should work fine....and is out of warranty! (conveniently for HP...)

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