cmos checksum bad? problems

[cornishboy]

hello all this is my second post on this matter,
im building a new computer and have done it by the book so far. when i turn the computer on this message comes up?
cmos checksum bad
usb device current
status detected system will shut down in 15 seconds.

i have tried resetting the jumpers by removing the battery and doing the clear cmos and resetting that then replacing the battery but at restart it say and does the same thing again!.
when i take out the ram idoent do this it just beeps none stop and theres no screen? im lost this is my first build so forgive me OID has been very helpful to me so far and told me to post it here instead.
the motherboard is an ASUS P5LD2 se.///the case is the galaxy mid black tower// hard drive is a 250gb hitachi sata// the graphics card is the radeon 3850 pro// atx 450w power supply//i have three diffrent ram available geil 2x1gb & 1gb of twinmos & 1gb kingston, now i know not to use them all there just what i have in my place , im at a loss here please help me please be forgiving it is my first build? thanks

[Disturbedguy]

When I had the error to do with checksum above i had just used the jumpers to reset and it worked fine.

With the USB line being in there..could it be a USB device thats causing the problems? have you tried disconnecting anything you dont need right away, like a printer or webcam or anything else?

[cornishboy]

yeap only got the main bits in cpu/gpu/hard drive/dvd rom rw/, thats about it? im really lost please help me.

[Disturbedguy]

thats all i can think of mate, i cant really think of what else it could be..maybe a dead CMOS battery or something else.

Sorry i cant be off more help

[superscaper]

thats all i can think of mate, i cant really think of what else it could be..maybe a dead CMOS battery or something else.

Sorry i cant be off more help

Well at the very least trying a new battery would eliminate that as the cause if there's still the same problem.

[Dingo]

Do you not have any usb device coneected (ie) keyboard or mouse. If you do check that they are connected properly and use alternatives if you have them (ie) if you have four usb inlets try the usb device in another as sometimes these usb inputs can become borked.

Also go into bios and check that any usb device you have is recognised and check settings for usb devices.

Let us know how you get on.

[joermcg]

"cmos checksum bad"

this error is usually caused by bad setting in the bios, or by another couple of problems, which being a new build won't be the cause of the problem.

If the problem was with your ram, you should get a double "beep" on boot-up so, imho, this may be a jumper setting being incorrect on the mobo, (a good look at the mobo manual will help) or, hopefully not, a short, caused by the mobo being grounded.