Sherrie what are the specs for the Z420 and Z820?
There's a lot of possiblities but I immediately suspect the Windows image and the Video card.
-the video card because it sounds like it's overheating-which would explain why you can run the machine remotely without this problem. That could mean defective video card or an improperly sized power supply or inadequate airflow in the cabinet. Since you've been given a replacement system, I expect that to rule out component defects.
The Windows installation was probably made using a disc image at HP. My experience with Dell suggests that a bad image affects entire platforms but only in subtle ways. On my machine all internet downloads were corrupted regaurdless of the webbrowser I was using. Have you tried dumping windows, formatting the disc and doing a clean OS load from the OEM discs?
Other causes could be non-ECC Ram, unsupported RAID configuration or overly agressive security/back-up software
Thanks for taking your time to help.
Z420 Model#B2B97UT --WIN7Pro, INTEL E5-1607, 3.0Ghz, 6GB RAM, Nvidia Quadro 600(1GB) I bought this knowing that Solidworks was not going to support XP or 32-bit forever and didnt have this problem for the first 10 months of usage. Before this Z420, I was operating on a HPxw8200 without issue.
Replacement from HP:
Z820 Model#E2A27UT --WIN7Pro, INTEL E5-2643, 3.3Ghz, 8GB RAM, Nvidia Quadro K4004(3GB)recommended by SW.
On the Z420, I had an "HP" tech here a numerous times replacing everything possible- Hard drive, Processor, Video card etc, (no help)
I did two complete reinstalls from discs on the Z420 (no help)
The Z420 had been in operation until June18. So for ten months of no issues to a nightmare.
Basically, HP then gave me a new machine(the Z820) and to their kudos... even some upgrades.
All components and peripherals in the CPU's are directly from HP. RAM on both is ECC.
I have also spent $600+ to replace monitor, cables, UPS. I've tried different keyboards and mice.
Today, I made arrangements for later this week....The HP tech is coming back to replace "all replaceable components" on this brand new Z820 that has only been in operation for less than a day. They acknowledge the problem and have diagnostic proof using their own software to send them reports of it's existance.
I have never had this problem on my z420.
It was one of the very first available - well over a year old now.
I have the e5-1620 processor, amd firepro v5900 graphics card.
Well after not freezing for two weeks It....the new Z820 froze at 1:30pm today. Near as anyone (including HP) can tell, its a Windows Update issue. So I'm in process of restoring to a previous day and we'll see what happens...