If you can enter bios (usually by pressing f2 or del), then load the default settings, otherwise, you will have to position the jumper properly, instructions for that are as follows.
1. Touch an exposed metal part of the case to ground yourself.
2. Unplug the power supply from the wall.
3. Move CMOS reset pins to short pins 2 and 3, then wait 10 minutes.
4. Replace CMOS reset pins back to 1 and 2.
5. Replug the power supply and boot.
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Did you already tried doing a system restore on the time that everything was working fine? if not yet tried doing that first and hopefully that will correct the problem but if still have the same problem you can try some anti malware software like Malwarebytes this will be helpful to you....
Check sum failure is an error on the configuration of the computer board. You have to reset the computer board to factory setting to get rid of this error (if check sum failure appears every now and then on the display). Make sure that you have the list of your cooking parameters before you reset the board to factory setting. Any settings made prior to a factory reset will be lost. Details on how to reset the board to factory setting can be downloaded at pitco website on www.middleby.com.
Having Problems With Error 21?
Cause: Error 21 takes place when the system is misconfigured or its essential files are missing. Such problems occur when a PC is not maintained properly and has accumulated many critical issues that require immediate repair.
Solution: To repair Error 21 correctly, download and install the repair tool below. This tool was design to successfully diagnose, find and fix the problems on your computer.
When your computer writes a block of data to a disk-drive, it calculates a "check-sum" value, and writes that value, along with the data. When your computer reads that same block, it also reads the check-sum value, and it recalculates the check-sum, using the same "Cyclic Redundancy Check" algorithm.
If the "new" check-sum matches the "old" check-sum, then it is declared that the data was correctly written & then read. Any "mismatch" indicates an "I/O-error", i.e., at least part of your disk-drive is dying, even though it's only a month old.
Maybe, it's only one file in one folder that has become "unreadable", but it could be much more.
Copy all the files that you can, and exercise the warranty on the disk-drive to get it replaced.
When you upgrade your computer to Windows XP, you may receive an error message
that is similar to one of the following:
C0000221 (Bad Image Checksum)
STOP: C0000221 - Bad Image Checksum
in ModuleName -or-
STOP: C0000221 - Bad Image
Checksum. User32.dll is possibly corrupt. The header check sum does not match
the computed check sum.
It comes back as a Internal Control Module Memory Check Sum Error. Unplug the battery positive terminal for a few minutes. Hope that gets rid of it. If it doesn't you are likely looking at changing out the engine computer.