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Checksum error - failed at checkpoint [7FH]
Dell Inspiron 531.
For some time it would not boot; unless I hit F1 and reset the date and time.
Then the power supply failed which I replaced.
Then it worked for a while (with the F1) but eventually would not get beyond the F1 prompt. I discovered that the USB keyboard and mouse would not work with a motherboard problem - unable to find a PCI card to accept a PS/2 keyboard and mouse.
Before throwing any more money at it; how can I test the motherboard?
DELL-Sujatha K
Community Manager
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Posted December 23rd, 2012 12:00
Hi KCTommy,
As rightly suggested by rdunnill try replacing the CMOS battery. It is available in any electronic/stationary shops. Please find the link below for instructions to replace the battery.
Also I request you to run diagnostics on the hardware components of the system. To run diagnostics restart the system and at the Dell logo tap the F12 key every two seconds. This will start the One-time boot menu. Using arrow keys select ‘Diagnostics’ and hit enter. This will run diagnostics on the hardware components of the system which may take around 5 minutes. Please reply to this post in case of any error message.
rdunnill
8 Professor
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Posted December 23rd, 2012 11:00
If you haven't replaced the CMOS battery, I suggest you do so.