i had purchase 2 1gb ddr ram pc400 and replaced my existing 512 ddr ram pc400 but when I boot up mobo detect the new ram but it does not continuosly boot but when i installed the old ram it is ok. my old ram is a Twin Moss ddr1 single sided and the new 1 is micromax ddr double sided and both are same ddr400. my mobo is an intel D101gg with p4 3.06ghz at 533 fsb. the new ram 184 pin 1gb pc400 SODIMM E90819G 128*8% is this one not compatible with my mobo thanks

Hello and welcome to PC Help Forum.

Firstly try one stick of RAM at a time.Put on stick in and reboot see what happens.Do this for each one but only as a single stick nearest CPU.

Can you run Belarc.com advisor and go to your user CP and fill in your computer specifications please.Giving full make model number of your mainboard.Thankyou.

System Model Windows XP Professional Service Pack 3 (build 2600)

Enclosure Type: Desktop Processor a

Main Circuit Board b 3.07 gigahertz Intel Pentium 4 16 kilobyte primary memory cache 1024 kilobyte secondary memory cache
Board: Intel Corporation D101GGC AAD35788-305 Serial Number: BTGC61100BTF
Bus Clock: 133 megahertz

BIOS: Award BIOS for Intel GC11010N.86A.0313.2006.0915.1840 09/15/2006
Drives
Memory Modules c,d 80.02 Gigabytes Usable Hard Drive Capacity 48.27 Gigabytes Hard Drive Free Space HL-DT-ST CD-RW GCE-8481B

[CD-ROM drive] HL-DT-ST DVDRAM GSA-4167B [CD-ROM drive]

3.5" format removeable media [Floppy drive] WDC WD800BD-22MRA1
[Hard drive] (80.02 GB) -- drive 0

1024 Megabytes Installed Memory Slot 'A0' has 512 MB Slot 'A1' has 512 MB

Local Drive Volumes
c: (NTFS on drive 0) 34.08 GB 17.62 GB free f: (NTFS on drive 0) 45.94 GB 30.65 GB free
Network Drives here a portion of belarc has log

As far as I can tell this board needs matching RAM sticks.You need to remove the 512 stick.
MemoryTwo DDR SDRAM Dual Inline Memory Module (DIMM) socketsSupport for DDR 400 MHz and DDR 333 MHz DIMMsSupport for up to 2 GB of system memory

Test each stick individualy please.

i had it tested 1 at a time and the ram is detected but seems to me the booting does not continue cause i do not see the usual thing that happen when the 512 ram is in place. the 512 ram is single sided and 1gb is double sided. when 512 ram is in place "memory freq. ddr 400 single channel is enabled" but when 1gb is installed i do not see that message after memory test on start up boot