Forum Thread

Biostar MCP6P M2+

turkeyfox 613 251 August 30, 2010 at 04:35 AM
Hey,

I'm trying to work out a new budget build with a Biostar MCP6P M2+ but it's running into problems. The first board wouldn't post no matter what I did so I RMA'ed it and got a new one. This one wouldn't post either at first but resetting the CMOS jumper solved that. Unfortunately after it posts it gives this error:

""CMOS checksum error - Defaults loaded

Press F8 to enable system configuration
Press F9 to select booting device after post
press F1 to continue, DEL to enter setup"

If I press DEL to enter setup and try to change any BIOS settings they won't save, the computer just restarts and then doesn't post. The fans and hard drive spin but there's a blank screen and no beep. I have to reset the jumper again and then it posts but gives the same error. If I press F1 to continue it tries to boot, but since I'm not gonna try to install an OS on a system with bad BIOS it sees that there's nothing to boot from and just waits for me to put in a bootable CD. Then if I restart the system after that it goes to the black screen with no post and no beep and I have to clear the CMOS again.

I successfully updated the BIOS but it didn't change anything, everything's still the same. Also changing the RAM, power supply, CPU (using either AM2 and AM3 because I thought that maybe the AM3 cpu was the culprit but it wasn't) and taking it out of the case and running it on a piece of cardboard didn't help anything.

Any ideas? I hope I don't have to RMA again because Biostar makes me pay for shipping Mad

14 Comments

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#2
Receiving that error doesn’t necessarily indicate a problem. Whenever the BIOS is saved, it also saves a checksum so it can detect a possible corruption. That message is merely telling you there is a difference between the checksum it just calculated for the current boot and the current checksum. And as a result, it has loaded the BIOS defaults, calculated a new checksum, and saved it to check the next time it boots. IOW, there isn't necessarily anything wrong. Not unless you're getting that message on every boot (which might happen, for example, if the CMOS battery was failing; it can’t save the checksum value, so it repeatedly fails the checksum test). Usually if you hit F1 it just saves the new checksum and continues normally.

As far as hitting DEL and making BIOS changes, that may be the real problem. It’s possible the checksum error is a byproduct of those changes. For example, you make some sort of incompatible BIOS change, the system can’t boot, the BIOS is corrupted in the process, you reset the jumpers, and up comes the checksum error. IOW, it’s the boot changes (or some other incompatibility) that’s causing the problem and the checksum error is just what normally happens as a result.
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Last edited by eibgrad August 30, 2010 at 05:23 AM
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#3
The only BIOS change I'm making is disabling the floppy drive. Originally there was a "Floppy disk(s) fail (40)" error as well as the CMOS Checksum error. I plugged in a floppy drive to make the floppy error go away (and to update the BIOS) so with the floppy plugged in it just says "CMOS checksum error - defaults loaded". I want to disable the floppy so I try to change it to "none" but then it restarts and doesn't post when it restarts.
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#4
Clear CMOS with jumper.

DEL to enter BIOS.

Load Fail Safe Defaults.

ESC then choose Save and Exit.

Reboot. DEL to enter BIOS. Disable Floppy and other unused ports. ESC then Save and Exit.

If you Save and Exit and the changes do not take, then replace the battery on the mobo with a new CR2032 lithium cell.
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#5
I wish I had a "Load Fail Safe" option. Unfortunately there doesn't seem to be one. Biostar tech support is being less than helpful as well :\
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#6
Try "Load Optimized Defaults" on the main page/right column.

Don't forget to change N to Y, by pressing the "Y" key, on the confirmation popups.
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#7
Did you install the standoffs under the board in all the places a screw goes through to attach the board to the case?
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#8
"Load optimized defaults" didn't work either. Still won't post after restarting. Biostar sent me an email telling me to RMA again. I sent them back an angry email with lots of exclamation points, hopefully it'll convince them to tell whoever's in charge that they need to do damage control and they'll send me a shipping label for free. Otherwise I'll just chuck the board, not worth $11 shipping just to get a third board that in all likelihood won't work.

Edit: and yes I installed all the standoffs correctly, had a gigabyte mATX board in the same case previously working fine
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Last edited by turkeyfox August 31, 2010 at 08:17 PM

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#9
Maybe time to change to a Gigabyte or MSI board. Asus is pretty good, too.

Just for fun, you could try to test the board outside the case. That may give you an indication of whether or not you have a standoff in each required spot or if the I/O shield is snapped in tight. If the board works outside the case, you have an install issue.
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Last edited by callpocket August 31, 2010 at 08:21 PM
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#10
Yeah that was my initial thought too, I tested it on cardboard with only the cpu and one stick of ram, nothing else (bare minimal setup) already but it did the same thing. Putting the hardware together is easy, it's just I was hoping someone with knowledge on the inner workings of BIOS software would see some obvious problem because once I push the power button how it turns that into a usable interface is all magic and fairy dust to me. Good call on MSI though, this was going to fill in for my really nice MSI board until it died last month (just out of warranty too) until I could afford a proper replacement. Guess I'll have to wait for a slick deal on one.
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#11
The people with in-depth knowledge of the BIOS can be found at

http://www.rebelshavenforum.com/s...matebb.cgi

Did you change the CMOS battery, as suggested by Eibgrad and G37?

I'm not saying BioStar is sloppy with its BIOSes, but some allow the memory voltage for DDR2 to be set to over 2.6V.
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#12
For the life of me I can't figure out how to take out the battery. I gave up on that and assumed it's still good because first of all it's a brand new board, it couldn't have drained already and also the BIOS displays the correct date and time which it wouldn't if the battery was dead (correct?)
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#13
How about complete system specs ? (part #'s if you have them)
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#14
Motherboard: Biostar MCP6P M2+ revision 6, latest BIOS

random white floppy borrowed from Windows ME era micron pc

WD hard drive 160GB sata

Lite On IDE DVD drive

the rest of the parts are either one or the other in various configurations to make sure that they're not the thing causing the problem

RAM: Crucial 2gb DDR2 667mhz (have 2 sticks but took one out for now because it's supposed to be more stable) OR Adata 1gb DDR2 800mhz (again, 2 sticks but only using one) OR Adata 512mb DDR2 800mhz (2 sticks, only using one)

PSU: Thermaltake 430 watts OR BFG 550 watts

CPU: AM2 Athlon x2 5000+ OR AM3 Athlon II @~2.8ghz (forget what it is exactly but both work fine in a different motherboard)
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#15
Quote from turkeyfox View Post :
For the life of me I can't figure out how to take out the battery. I gave up on that and assumed it's still good because first of all it's a brand new board, it couldn't have drained already and also the BIOS displays the correct date and time which it wouldn't if the battery was dead (correct?)
Try and power down the system, and pull the power plug out of the PSU for a minute and push the main power button (front of PC) for a sec.

Plug it in and goto BIOS and check the clock again.

It could be a bad BIOS download. Get the file again and try to reflash with the new file.
http://www.biostar-usa.com/app/en...p?S_ID=370
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