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ASUS Support Home Location : Forum > Motherboard > p5e  
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  Topic : [Problem]CMOS Checksum bad error New Topic
Yann
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Posts : 8
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Tech Points : 1
From: Ireland
Posted:12/20/2007 10:07:00 AM # 1
Ok, so I just setup this new PC:
- Asus P5e
- E6750
- 2gb DDR2 1066 (OCUK)
- 8800GT
- Seasonic s12 650w


- Very first boot => no post
- 1st reboot => Post, but "CMOS Checksum bad -  Press f1 for setup - F2 to load default settings" etc
Checked Bios settings. CPU is underclocked at 2.11Ghz instead of 2.66. No big issue, can be sorted later on, I thought. Apart from that , all settings on auto look OK. So save and..
- reboot. => No post
OK, I thought so clear cmos is in order. Proceeded to clear cmos (Complete pwr off, switch, pwr on, swicth, turn on...)
- => no post.
- shut down, reboot => Post, but CMOS Checksum bad.

Go to Bios, save and exit, reboot same thing again:
- no post
- clear cmos
- no post
- reboot => Post, but "CMOS Checksum bad"

Again and again....

Updated Bios with EZ flash from 0203 to 0501 >>> Same issue

Started to check out on internet, and it seems it's not an uncommon issue.

Downloaded 0502 from Asus'own ftp (2nd Bios update in like 10 days???) . Same issue.

Unplugged USB devices, same issue. removed 1 stick of ram same issue.

100% sure CMOS battery works since date settigs are retained even when PC is not connected to the mains for 30 mins.


Will revert to previous (early ones seem best) Bios version since this is beta, but do you have any suggestion?
Apparently people with DDR-6400 have no such issues. is there a problem with 8500+?


Any help appreciated.
Cheers!

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OConnor
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Posts : 22
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Tech Points : 0
From: United States
Posted:12/21/2007 8:10:00 PM # 2
The P5E has problems with memory at 1066! Revert memory manually to 800mhz.

(yes I was very disappointed)  Also when you clear the CMOS with switch on the board, you have to remove the battery for a minute.. I am using BIOS 0502, best version so far I think.

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CCNA A+ Network+ CoolerMaster Cosmos P5E E6750 Corsair HX620 4gig DDR2 800mhz 2 Seagate 7200.11 500mb HD Vista Home Premium
Yann
VIP Member
Posts : 8
Level :
Tech Points : 1
From: Ireland
Posted:12/22/2007 1:10:00 AM # 3
Disappointing indeed! If I had known, I would have gone for 4gb of pc6400, and not 2 of pc8500!! :((( (or a different board altogether!)

Anyway, this works fine at 800mhz.

Kudos to Psychostreak from the ARS TECHNICA fora for his help, and giving me the right answer, first! :)

I hope 0502 is good, because I installed it yesterday when troubleshooting this issue!

Thanks to you OConnor as well.

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OConnor
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Posts : 22
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Tech Points : 0
From: United States
Posted:12/22/2007 1:21:00 AM # 4
Irish guys have to stick together :)

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CCNA A+ Network+ CoolerMaster Cosmos P5E E6750 Corsair HX620 4gig DDR2 800mhz 2 Seagate 7200.11 500mb HD Vista Home Premium
Rick
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Tech Points : 11
From: Canada
Posted:12/23/2007 12:26:00 AM # 5
I have absolutely no problem running my Corsair XMS2 8500 CD5 at 1069mz. You have to ensure the DDR voltage is set correctly; for me this is 2.20V-I have the Micron chips-must be done manually. BIOS 0501 is seriously flawed, but, 0502 has been working very well for me.

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[GWA] Bond =FOUNDER=
Member
Posts : 1
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Tech Points : 0
From: Canada
Posted:1/3/2008 1:13:00 PM # 6
Hello All.

I have the same issue. Yann your not allone... Only thing is I have DDR2 800Mhz :). Yet since I recieved the exact same errors your have, I am unable to install my other 2 gigs of ram.

I have managed to get my PC to boot with no errors with only 2 gigs installed and the entire PC pulled apart and sitting on my desk.

GO DESKTOP ANTI STATIC BAG TESTING.
I am reverting to another bios since I feel 0502 is messed. Also getting a new case as I feel a ground fault my be an issue aswell.

Asus P5E
Intel E6600
4 gigs OCZ 800Mhz
BFG 8800GTS
Thermaltake ToughPower 850 Watt

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McJaffa
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Posts : 33
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Tech Points : 0
From: United Kingdom
Posted:1/8/2008 12:33:00 AM # 7
I have same kind of issue, when cold it won't boot. The fans spin but no post beep or anything. If I turn it off and on again it kicks the CPR function in and comes up with the "F1 to enter bios, F2 to load defaults" message. I can then go into bios, not change a damn thing and it boots up fine and will run all day happily, but when I turn it off then turn it back on the next day it does same thing again.
Has anyone else come up with a solution to these random system hangups at boot? I might have suspected my PSU, but it is a good quality unit and worked fine with everything else the same in this PC except it was a M2N32 sli deluxe mobo and amd 4800+ chip. I am sure they draw at least as much current as this P5E/e6750 combo.
I upgraded bios from 0203 to 0502 but it stilll does it.


P5E
e6750
zalman 9700 cooler
2 x 1G OCZ PC6400 platinum XTC
inno 8800GTS
Tagan 580-u15 psu

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trafsta
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Posts : 23
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Tech Points : 0
From: Canada
Posted:1/8/2008 1:26:00 AM # 8
From what I've read bios revisions 203 and newer have issues with ram that use "Micron D9GMH" chip:

You're ram has the affected chip:
http://ramlist.ath.cx/ddr2/

See this URL for more info:
Problems with your RAM after bios 0203/0303/0401?

I have the same problem with my Crucial Ballistix 4x1GB PC2-8500 ram. I'm using some old PC2-6400 ram in the mean time until ASUS fixes this issue with a newer bios. From what I heard 1xx and 201 bios firmware for the P5E works fine. I also read that 402 might work as well, but I am awaiting confirmation from other people before I downgrade from 502 to 402.

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McJaffa
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Posts : 33
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Tech Points : 0
From: United Kingdom
Posted:1/9/2008 2:46:00 AM # 9
I would think twice before you do that, the safe ways of bios flashing do not permit you to load a previous version, and the windows updater is not safe.
I speak from experience as I killed the M2N32sli bios that I just replaced with this P5E.

...oh, and funnily enough I was trying to downgrade because the latest bios was bugged to hell and caused my system to run at basically half speed.

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trafsta
Member
Posts : 23
Level :
Tech Points : 0
From: Canada
Posted:1/9/2008 9:04:00 PM # 10
Yep I think I'm not going to risk it as I have heard horror stories as well. I'll just keep this crummy generic PC2-6400 ram in my system until the problem is resolved. After all, how long could it possibly take? Its affecting thousands of people (most will never make their way to this forum I'm sure) so Asus has to do something soon, right? :)

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