compaq evo 510D invalid checksum in cmos

January 15, 2012 at 22:00:46
Specs: No OS, bios/cmos problem, Celeron?
This compaq evo 510D has no floppy, optical, or harddrive, so I am attempting to boot using a 8Gb thumbdrive loaded with Ubuntu Linux that is known to work on other computers. I never get to it - It passes the post memory check and then says "invalid checksum in cmos... press F1 to save default values" ...and then you're stuck. Pressing F1 does nothing. Just sits there with that message. Also asks about PXE boot to network and offers function key choices - none work.

Is it possible the CMOS was removed when they "REMOVED ALL MEDIA"?

I could use a GOOD board diagram, with real part names - like a manual!

Thanks in advance,

Lou


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#1
January 16, 2012 at 01:40:20
Is it possible the CMOS was removed when they "REMOVED ALL MEDIA"?

Who is they?

You cannot remove the CMOS unless you start pulling chips off the motherboard. The CMOS is integrated into the BIOS chip

Go into the BIOS and set the USB as first boot device. Check Time and date and save, exit and reboot. F10 is the normal key to save an exit.

Stuart


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#2
January 16, 2012 at 10:43:33
Thanks for your post, but it is not the answer. This machine was "wiped" (by THEM - whoever THEY are) prior to its sale to me. So it has NO media - no drives.

Of course I would go into the bios setup - IF I ONLY COULD!!!

The problem is I can't get there... after successfully POSTing the memory, it says "invalid checksum in cmos... press F1 to save default values" ...and then you're stuck. Pressing F1 does nothing. Pressing ANY function key does nothing. I know the keyboard works cause I can escape (Esc) from the memory test, and the only keyboard combination that works subsequently is ctrl-alt-del.

It looks like the system freezes when it tries to write the default values into CMOS, but it also might be trying to PXE boot to access a local server (which doesn't exist on MY lan)

By the way, not all bios are integrated into the same package as the CMOS. And yes, I have replaced defective chips that were socketed on the motherboard. I need a better manual than the one I downloaded from HP.

I replaced the battery with one I had lying around, I'll go get a new one later and see if it helps.


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#3
January 23, 2012 at 05:25:13
The new battery did not help. I DID however notice that A DIFFERENT computer I have would not recognize this keyboard's function keys during bios / setup if I plugged it into USB - but if I plugged into USB->KYBD adapter and then into computer's keyboard interface it worked fine.

Of course, the compaq evo ultra slim has no keyboard jack and none of my other keyboards are USB. So I am looking for a black/silver Compaq usb keyboard. I guess if it still fails I'll at least have a shiny new keyboard for my troubles.


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