Weird freeze/crash on desktop HP Pavilion a6500f - everyone seen elsewhere?

Before I open this thread, let me tell you a little of myself in terms of my training.

I am a service technician with a small org non-profit based in Seattle, WA.  My mandate he gave me six years of experience in the field with many brands and models of machines whose age varies between 2 and 7 years and beyond, so I think I know what I'm talking about, if there are doubts about my expertise.

Most of the time, we get calls from malware mundane boredom of our customers, but on rare occasions, a cost-of-the-store model crosses our proverbial office with some out-of-this-world difficulties.  What follows is one of those strange cases:

A customer entered the week last of the local Community College with a desktop computer a6500f flag off-warranty purchased from a local Best Buy at the beginning of ' 09. The machine would be start-up and test OK, but he has categorically refused to boot the OS (Vista) without BSOD or simply lock up, three months after the expiration of the warranty. Before that she brought to us, she paid a visit to Geek Squad.  Some tech he spent diagnosing the problem, but couldn't get a handle on it and thus eventually throw the bewildered woman at their dirty dogs, which suggests that she get a new PC altogether.  My God, how awful!  (And I already hated Best Buy for different reasons, but that's for another time.)  I don't know exactly how she got wind of us, although it could have been through staff of college classmates.  Needless to say, we took the system.

A couple of our volunteers tested the a6500f Monday and confirmed his diagnosis - frozen!  The boys are perplexed.  They tinker with it a bit, but always come back upward with the same problems of gel.  We can't go any further.

I reported on Tuesday, after taking out a sense of under-time, and I've tried a few things.  Always locked.  A ran the F9 diagnostics on the thing shortly after, then tell me that there is a RAM problem.  Interesting.  I haven't ripped a DIMM - no change.  I went from banks - nada.  Tried the same tactic of switch with the other DIMM - niet. I ran a test utility of third with the two DIMM memory in (4 GB total) that subsequently find mistakes in two DIMM modules.  This brings me to a conclusion: replace all the RAM.  We had a DDR2 memory to spare, so I asked the Manager with what we had.  Although we couldn't find everything sticks of 2 GB, we had more than enough DIMMs to make a pair of 1 GB that would allow the unit to run. Never mind that they were slow (533 MHz) AND another brand.  As long as they worked...

So, we installed a pair and started the a6500f with 1 GB.  Eureka!  Vista began as if unharmed and ran for a day and a half while I updated the kernel of the system and other pieces.  Meanwhile, I call HP and declare my findings, while the Manager shuts down for RAM costs - another kit of 4 GB to be exact, and it is clocked at what we think it's the correct speed of 800 MHz (it was the same as the original of the RAM).  It is Kingston brand.  It'll work.  Or so we thought this morning when the Manager brought through.  After a few tasks more, I have install the new thing.  Three hours later... oh shit!  Relapse full!  We are SO screwed!

Then I get the idea that this RAM high speed may not be a good match for the system.  In order to exclude the original RAM was 'bad', I had it installed on a Dell machine, which is known to be able to recognize up to 8 GB.  I ran across the same test as was done on the a6500f.  The set of 5 (4 + 1 pairs) Go past on the Dell.  We then install 2 GB of Dell (he had a total/3 GB in 2 + 1 pairs) in the a6500f.  It's 667 MHz RAM, which once again makes the machine stable.  I am flabbergasted! Now what?  Is there something I missed? Have we really bad RAM, or is it a foul on a6500f motherboard that will not allow the 800 MHz DDR2 works well when lower speeds are OK?  We will test a kit 4 GB soon to confirm this theory.

Clues would help, because it is not in our nature to leave customers with less they came in.

And Yes, the BIOS was 5.27 upgrade.

Nathan Alden

Wilderness Technology Alliance

Really quick update: solved the case and I am now able to view the complete results.

We have since then replaced the temporary 2 GB kit with two Corsair 2 GB PC2-5300 DDR2 DIMMS.  The affected a6500f worked without incident for 20 hours, and I indeed write this follow up on it.

What I think happens is as follows:

While still uncertain of whether it is a problem of CPU or motherboard, I know that the two are involved in a certain measure.  Why he even developed is confusing at best.

According to the technical basis of the Intel FSB of the Pentium Dual Core E2220 of 800 MT/s is not meant to work in harmony with the memory bus.  The original memory rated at 800 MT/s (megatransfers/second), corresponding so the FSB, he failed to Board of Directors (Napa), like two other similar kits used in place of the original.  All had the same question, either immediately or within a short time of starting.  Windows Vista was not activated and non-recoverable in such cases.  Fortunately, the data on the machine has been largely unchanged.  We know because spent two kits of low speed. This allows to operate normally.

The present package amounts to 4 GB, is NOT a matter of sizing / memory address.

In order to completely exclude the Commission or of the CPU, we need test the Napa Board with memory for Core 2 Duo AND 800 MT/s, but we do not have similar systems. or we would be willing to forward additional cost for the sake of experience.  We were lucky to have just enough resources on-site to get that we have done and put an end to this case.

So, I will mark this problem solved, but I also ask that other users with the same type of problem on similar hardware refer to this thread.

Nathan Alden

Wilderness Technology Alliance

Tags: HP Desktops

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