The CMOS Settings Wrong, CMOS Date/Time Not Set are telling you the date on the device is not set.
what is CMOS? CMOS is Complementary Metal–Oxide–Semiconductor or CMOS RAM, Non-Volatile RAM (NVRAM), Non-Volatile BIOS memory: Most CMOS batteries will last the lifetime of a motherboard, up to 10 years in most cases.
1- It’s possible if the device was a long time without power and the CMOS battery is drained out or either the CMOS battery is dead.
1- Solution A – if the CMOS battery is not dead you connect to power and set the date and time and let the device charge that battery. If after a long time you can remove the power cable and reconnect it. If you restart the device and do you still seeing the same message about “CMOS Settings Wrong”: Definitely the CMOS battery is dead!
2- Solution B – You will replace the CMOS battery; you search by brand and model and buy a new battery.
The BIOS power management state
The system is turned on. The CPU is executing or ready to execute instructions, PCI activity is full, AGP activity is full. RAM is being read from, written to or refreshed. Hard disks are on.
S1 “Power On Suspend/Stopgrant” MS: Standby
The system is turned on. The CPU is not executing and is not ready to execute instructions, although registers and caches are maintained. Devices signalling support for S1 are in the on state, devices without support for S1 are in the off state. RAM is idle, but refreshed. Any device currently in S1 with support for resuming may resume the system (WOL, WOR, keyboard, mouse, timer, etc.). PSU state is on. Hard disks are off in this state and all states deeper.
Confusing “common” names. S2 is quite logically an intermediate between S1 and S3. RAM refreshes normally. The CPU is in state much like S3. In fact, this is pretty much S3 but with a faster RAM refresh.
S2 is in the spec, but not usually implemented.
S3 This BIOS management state shuts down all components, including the CPU, but the RAM remains powered on. The system is able to respond to wake up commands, such as a key stroke on the keyboard. This state can be referred to as standby or suspend mode
S4 “Suspend to disk” MS: Hibernate
All hardware is in the off state and maintains no context. The system may only be resumed by timer or other hardware resume devices (such as WOL or WOR), but not by interrupts. The contents of RAM are saved to disk and replaced on resume. The PSU is in the off state. Power may be mechanically removed without ill effect.
Note: S4BIOS is a variation of S4 wherein the BIOS reloads the image and not the OS boot loader. As NTLDR is S4 compatible, this is generally used with other OS’. Linux S4BIOS support is “experimental”. Note also that using Windows2000 or XP with grub or lilo WILL break S4 support.
S5 “Soft-Off” MS: Hibernate
All hardware is in the off state and maintains no context. CMOS is maintained by 5Vsb, as in S4. The PSU is in off state. Power may be mechanically removed without ill effect.
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A BIOS, Basis Input/Output System. All hardware requires a software to run allowing the communication of the caractheristics of the hardware, such as its unique features, memory location, and input/ouput setting, to enable communication between the motherboard and CPU, hard disk drives, optical drives, keyboards, and other peripherals.
During the start-up process, however, the information about hardware is provided by a microchip on the motherboard called BIOS.
A BIOS is known as firmware is a software that is hard-coded into hardware but can be modified. You can download the new BIOS software from the motherboard vendor.
When you start a computer, the BIOS initializes the main hardware components and tests the system before selecting a hard disk to boot from and loading the operating system for example Windows, Mac, Unix or Linux and etc. The process of initializing the main hardware components and testing the system is POST. A POST is Power-On-Selft-Test.
The steps that occur during a POST are:
- The BIOS is initialized and checked
- The CPU registers are verified
- The size of main memory, RAM, is verified and, optionally, RAM integrity is checked.
- The system devices are detected and initialized.
- The boot device with the highest priority is selected and its master boot record or MBR is executed.
When a computer performs a POST, it displays a summary screen. This screen varies depending on the BIOS or motherboard manufacturer, but it identifies the BIOS version and the date.
This summary screen must gives the option to enter to the CMOS setup utility.
CMOS is a Complementary Metal-Oxide Semiconductor is a microchip used by the BIOS. It stores variable system setting, such as the date and time, CPU speed and the bus settings. The BIOS accesses these settings when a computer is started, to obtain specific configuration information about the computer’s hardware.
The CMOS setup utility allows view statistics or change certain settings on the CMOS like RAM, internal and external media, power usage, system fan and CPU.