Dell Inspiron 530. At start up gives CMOS checksum error defaults loaded. Options press F1, F2 or F12 computer does not react. Has new CMOS battery. RAM OK. Did CMOS clear and password reset. What else can...
When a Power Supply is plugged into power, there is a constant 5 Volts present. The 5 Volt Standby Power.
You press the Power On button.
This in turn presses against the Power On switch, located inside it's plastic assembly.
The Power On switch is a Momentary Contact Switch.
Temporary closing it activates the Soft Power On circuit.
A 5 Volt circuit that utilizes the 5 Volt Standby Power.
The Soft Power On circuit 'excites' the Power Supply, and turns it on.
(Sounds like a seedy novel)
The first chipset (Integrated Circuit) to receive power is the BIOS chipset.
The Basic Input/Output System program is initialized.
BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.
A checksum is computed as an error-detecting code, to protect the BIOS settings stored in CMOS.
Each time the computer is turned on, this number is re-computed; and checked against stored values.
If they do not match an error message is generated, to tell you the CMOS memory contents may have been corrupted; and therefore some settings may be wrong.
Your BIOS assumed the settings were incorrect, and loaded BIOS default settings; stored in BIOS.
(Default = factory settings)
CMOS Checksum Error Defaults - Loaded
New battery? Nope didn't help.
Clear CMOS, and password reset? Nope didn't help.
Leaves Virus as the problem, or hardware component/s on motherboard; are bad.
("BAD motherboard. NO,...........you know you have been bad,....don't give me that look. You're a bad motherboard."
That's my diagnosis.
(Unless you put the CMOS battery in upside down.
+ goes UP)
Mar 17, 2013 |