Admin wrote:

> Earlier this week, I have run a memtest86 in the office and found out that
> the memory was bad (lots of red error messages on the screen).
> I took it to the computer store, they tested it, and they found the same
> errors. The guy said he cleaned it, set it back into place, ran the
> memtest86 again, and it went through without any error.
> Back into the Office, I have the memory problems again, I run memtest86
> and... The red warnings showing the errors again.
> The memory and the mobo are all brand new, they're not dusty at all.
> I did the test with another memory, and there are also these errors.
> Should I change both of them? Is there a way to "clean" them, or to fix
> them?

You deserve a refund because you paid to have the computer fixed or at
least diagnosed exactly, not to have a clueless guy tinker with it and
do something useless. I can't imagine dust on a new mobo and memory
being thick enough to affect anything, so why didn't the guy simply
chant and pray? In the repair report, what are the values of the
voltages, not just the PSU's but also for the CPU core, memory bus, and
AGP slot?

I'd remove and reseat the memory, but if that doesn't help (it probably
won't), change the memory parameters in the BIOS. Sometimes the
automatic settings (SPD) are wrong for a module because it's rated
faster than the mobo's memory speed (i.e., PC3200 memory in a PC2100
mobo) or the module maker was lax about screening its chips for speed
and quality and used marginal ones (often the case when the chip
maker's part numbers are missing and the chips have only the module
maker's marks on them) that may require underclocking. I've
experienced this even with some national brands, most recently
Kingston.

A memory diagnostic has to be run for several hours, maybe overnight,
to find all errors, and while MemTest86 has gotten high marks (see
www.realworldtech.com review), you should also use Gold Memory
(www.goldmemory.cz) to find errors it misses. Gold has also missed
errors for me, so it's important to use both diagnostics.