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I have a 838gm gateway,Ive tried to install 4gb of ram ,when I install more than 2gb,it will not boot

Answers :

\015\012try to check your motherboard it is INTEL 915G if so, see this info below.
\015\0121.6 System Memory
\015\012The boards have four DIMM sockets and support the following memory features:
\015\012• 2.5 V (only) DDR SDRAM DIMMs with gold-plated contacts
\015\012• Unbuffered, single-sided or double-sided DIMMs with the following restriction:
\015\012Double-sided DIMMS with x16 organization are not supported.
\015\012• 4 GB maximum total system memory. Refer to Section 2.2.1 on page 55 for information on the
\015\012total amount of addressable memory.
\015\012• Minimum total system memory: 128 MB
\015\012• Non-ECC DIMMs
\015\012• Serial Presence Detect
\015\012• DDR 400 MHz and DDR 333 MHz SDRAM DIMMs
\015\012Table 6 lists the supported system bus frequency and memory speed combinations.
\015\012Table 6. Supported System Bus Frequency and Memory Speed Combinations
\015\012To use this type of DIMM… The processor's system bus frequency must be…
\015\012DDR 400 800 MHz
\015\012DDR 333 (Note) 800 or 533 MHz
\015\012Note: When using an 800 MHz system bus frequency processor, DDR 333 memory is clocked at 320 MHz. This minimizes
\015\012system latencies to optimize system throughput.
\015\012􀀒 NOTES
\015\012• Remove the PCI Express x16 video card before installing or upgrading memory to avoid
\015\012interference with the memory retention mechanism.
\015\012• To be fully compliant with all applicable DDR SDRAM memory specifications, the board
\015\012should be populated with DIMMs that support the Serial Presence Detect (SPD) data structure.
\015\012This allows the BIOS to read the SPD data and program the chipset to accurately configure
\015\012memory settings for optimum performance. If non-SPD memory is installed, the BIOS will
\015\012attempt to correctly configure the memory settings, but performance and reliability may be
\015\012impacted or the DIMMs may not function under the determined frequency.
\015\0122.2 Memory Resources
\015\0122.2.1 Addressable Memory
\015\012The board utilizes 4 GB of addressable system memory. Typically the address space that is
\015\012allocated for PCI Conventional bus add-in cards, PCI Express configuration space, BIOS (firmware
\015\012hub), and chipset overhead resides above the top of DRAM (total system memory). On a system
\015\012that has 4 GB of system memory installed, it is not possible to use all of the installed memory due
\015\012to system address space being allocated for other system critical functions. These functions include
\015\012the following:
\015\012• BIOS/firmware hub (2 MB)
\015\012• Local APIC (19 MB)
\015\012• Digital Media Interface (40 MB)
\015\012• Front side bus interrupts (17 MB)
\015\012• PCI Express configuration space (256 MB)
\015\012MCH base address registers, internal graphics ranges, PCI Express ports (up to 512 MB)
\015\012• Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI Express addin
\015\012The amount of installed memory that can be used will vary based on add-in cards and BIOS
\015\012settings. Figure 17 shows a schematic of the system memory map. All installed system memory
\015\012can be used when there is no overlap of system addresses.

click the link below for more info :
Gateway's website says this motherboard will support 4GB of DDR333 or DDR400 memory. I would suggest testing each memory modules by plugging it into the board by itself, then rebooting. This way you can catch a bad DIMM that might be causing problems. If each one checks out then start adding one module at a time, rebooting after each one. If it still stops booting after you add a module, you probably have a bad system board, and only now that you are adding the extra memory are you finding that out. If that is the case, try contacting Gateway support. Maybe they would be kind enough to cover repair under warranty.
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