I have installed a 512 at 333mhz and another 256 and a 128 both at 266 mhz. I put them in and reset cmos and bios recognizes all of my memory but windows vista only recognizes the 512. When i originally put the computer together and installed windowns i used the 512, is there anything i must change to make it recognize the additional memory? Any information about bios recognizing my memory but not windows is greatly appreciated.
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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.
My thoughts? Bad motherboard.
("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)
you can try this option to if you sure that your dvd drive is working properly remove the battery on the motherboard and put it back this operation srestart to bios and try again to boot from dvd drive.
ok, now try to take out the memory, and power on again (you should hear long beep sound from the buzzer) turn off again and put back the memory . check your processor installation (what is fan status?), now look for jumper near bios battery (clear CMOS), go to this link for more info about Clear CMOS.
Hello, First thing I would try is to just install one of the new modules in the DDR1 slot and see if it boots. If it does, go into your BIOS (Use the key I believe.) and set the ?Max Memclock (Mhz)? field (Advanced Chipset Features submenu) of the BIOS to 200. Save & Exit and allow it to boot. Shut down the computer and install the second one. Again go into the BIOS and verify it is detecting both. A second thing to try if that does not work is to install the new modules, and before powering up, reset your CMOS using the jumper between the battery and the AGP slot. If the jumper is on the 1st and 2nd pin, put it on the 2nd and 3rd pin for 15 seconds. Then replace it to the original position. NOTE: Make sure the power is OFF and the power cord unplugged when you do this. You should also press and hold the Power button for 5 to 10 seconds to discharge the capacitors in the system. If this still fails to get you going, you may have high density modules which do not work in all motherboards. Did you get the modules from MS Memory Suppliers? When I did a search for your motherboard it only gave me DDR266 PC-2100 DIMMS as compatible. No DDR400 were listed even though they should be backward compatible. Hope this helps. Thanks for using Fixya. Comment back and let me know your results.
I would first clear the cmos. Then try to get back into the bios and check the ram voltage setting. My Asrock board AOD790GX128M had me use the #3,4 memory slots, the #1,2 gave me the bsod. You may want to try that also. I hope this helps you.
Sometimes, if the memory is a newer type, even though it matches the specifications laid out by the motherboard, there may be other factors like timing and voltage which cause a motherboard to not function with that memory. A lot of the time a motherboard manufacturer will be made aware of this problem and release a BIOS update to resolve it. Have you checked the motherboard manufacturer's website, ESC, to see if your particular motherboard is up-to-date with the most currently released BIOS version?
You can figure out what version of BIOS you're running if you go to Start -> All Programs -> Accessories -> System Tools -> System Information. On that first page it will list the BIOS version information and the date of that BIOS. If ESC has a newer BIOS available, you might try updating the BIOS to see if that resolves the issue.
Try RAM with a different speed. My 800 mhz RAM didn't work until I installed 533 mhz RAM and adjusted to 800 mhz in BIOS. Newly built PC, default must be set as 533 mhz because I reset the CMOS and still couldn't POST to BIOS. Only taking out all RAM gave me any sort of audible error code. Luckily I found some 533 RAM before I RMA'd the board.
I had the same issue on this board where it came with a Samsung 512 MB 533 MHz PC2-4200 DDR2 DIMM. I put in a 1 GB Kingston with the same specs (533 MHz PC2-4200 DDR2) and it would not recongize the Samsung anymore with the system reading as 1 GB of RAM instead of 1.5 GB. Tried every configuration and would only see the Kingston. It would only see the Samsung if I pulled out the Kingston regarless of the slots I use. So, I just bought the exact same make/model of Kingston and it recognized that fine and the system now has 2 GB of memory (max this board allows). And, I had already installed the latest BIOS for this board from Intel before doing all this so wasn't an old BIOS. I'm figuring the board didn't like something about the Samsung memory (speed, module configuration, etc.) that made it not play nice with the Kingston. If interested I bought the DM8400A/1G Kingston modules. And, this board appears not to support dual channel memory. Only has channel A, slots 0 and 1, and I read need two channels to support dual channel (seems obvious). Boards that supports dual channel memory normally have 4 memory slots, two for channel A and two for channel B, then put in matching modules in slot 0 for channel A and B and have dual channel memory access. And if want more ram, then matching modules in slot 1 for channel A and B.
If you installed total 4GB memory, the system will detect less than 4GB of total memory because of address space allocation for other critical functions, such as:
- System BIOS (including motherboard, add-on cards, etc..)
- Motherboards resources
- Memory mapped I/O
- configuration for AGP/PCI-Ex/PCI
- Other memory allocations for PCI devices
Different onboard devices and different add-on cards (devices) will result of different total memory size.
e.g. more PCI cards installed will require more memory resources, resulting of less memory free for other uses.
On a SLI system, since PCI-Ex graphic cards will occupy around 256MB, another 256MB will be occupied after you install a 2nd PCI-Ex graphic card. Hence, 2.75GB memory left only if two SLI cards installed on A8N-SLI Premium while 3.0GB memory left with one graphic card without other add-on devices.
This limitation applies to most chipsets & Windows XP 32-bit version operating system.
If you install Windows XP 32-bit version operating system, we recommend that you install less than 3GB of total memory. If more than 3GB memory is required for your system, then below two conditions must be met:
1. The memory controller which supports memory swap functionality is used. The latest chipsets like Intel 975X, 955X, Nvidia NF4 SLI Intel Edition, Nvidia NF4 SLI X16, and AMD K8 CPU architecture can support the memory swap function.
2. Windows XP Pro X64 Ed. (64-bit) or other OS which can address more than 4GB memory.
You can check below URLs for reference: