Re: mixed size DIMMs on P5P800 problems
- From: Paul <nospam@xxxxxxxxxx>
- Date: Fri, 09 Oct 2009 23:31:29 -0400
Jeff Haferman wrote:
Hi -
I have an asus P5P800, it has 4 DIMM sockets...
The blue sockets (A1, B1) had 512MB PC3200 CL3 non-ECC,
and the black sockets (A2,B2) were empty.
(brand = "spire"), and all was working well.
I put a pair of 1 GB PC3200 CL3 non-ECC DIMMs in the open sockets
(brand = g.skill) and got a single beep from the bios POST and no start.
I removed the 1 GB sticks and everything booted up fine.
I then removed the 512MB sticks, and placed the 1 GB sticks into (A2,B2),
probably should have put into (A1,B1), but the machine booted and
recognized 2 GB of RAM.
I then added the 512 MB sticks back, no boot. I swapped the banks, no
boot. Now, I went back to the original configuratin, 512 MB sticks
in (A1,B1), and no boot. I tried the 1 GB sticks in the various banks,
and no boot.
Bottom line, the machine now will not boot with any of the memory. I
get nothing on the display. I doubt it's a video problem because I
can't hear the Windows startup sound, it really looks like the memory
somehow got fried? I was disconnected from power and had my ASD
wrist-strap on, so I don't know what happened.
I'm just getting the single beep on bios POST (this is AMI bios)... if I
remove all the DIMMS I get 1 long and 3 short beeps.
Any ideas here? FWIW, I just tried resetting the CMOS in desperation,
still no go. I also have some ECC sticks around, I just tried those and
I got 1 long 3 short beeps.
TIA
There are two separate procedures you can try, to recover the system.
1) Power off the computer. Remove *all* RAM. Power on the system. Let
it beep for a few seconds, so it realizes there is no memory. Now, shut
down the system and shut off all power. Reinstall 2x512MB RAM. Power up.
Does it POST ? (Sometimes, one startup with no memory present, will
recover a system).
2) Power off the computer. Use the "Clear CMOS" procedure in the user manual.
You'll have to restore any custom CMOS settings, when the computer starts
the next time. You can leave the RAM in the computer for this procedure.
If the "Clear CMOS" worked, the real time clock should have been reset
as well. If the real time clock is reset, you can assume the clear operation
was a success. If successful, you'll be able to get into the BIOS and
configure things again.
Give those a try, and report back.
Since the 2x1GB G.Skill configuration worked, it suggests the RAM
is a proper type, and not the "high density" stuff. You could always
use CPUZ (and its "report.txt" file) to dump the 256 byte SPD tables,
and get some idea as to what kind of RAM it is. The memory chips may
not be visible, or the part number printed on them may be bogus, so
the odds of identifying the memory construction from the chip numbers,
isn't too good. Once the 256 byte table is in hand, you need a document
from JEDEC.org, to decode the declared memory configuration (what the
BIOS is reading and getting so confused about).
Paul
.
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