Mobo will not boot system

wrong that mobo is not blue and is not made by intel.com at all
it is ASUS..com
says so on the mobo
and at their web sets all mobo sold by them from 1995 to
2022, have QVL LIST ON CPU, ALL DO THERE.
SO FIND IT OR ASK THEM.
TOOK ME 3 SECONDS TO FIND THIS GOOGLE


https://www.asus.com/us/SupportOnly/P5S-MX%20SE/HelpDesk_CPU/

QVL = QUALIFIED VENDOR LISTS, RAM OR CPU
FROM 1995 TO NOW, AND ASUS.IS THE BEST DYI MOBO MAKER BAR NONE, AND GIGABYTES TOO. 2ND FIDDLE.

This link just might help with your problem!

http://www.tomshardware.com/answers/id-1831143/supported-cpu-list.html

cpu speed has nothing to do with ram. they are completely independant. ram speed is important to the FSB (front serial bus) this is the speed at which your motherboard communicates with the devives attached to it. cpu speed refers to how fast a cpu can process info. or how fast it "thinks". most motherboards have the capability of upgrading cpu's. your mobo (motherboard will support the following cpu's:
any pentium 4 up to 3.0 ghz
it supports the following ram
ddr (nott ddr 2 or 3) up to 2 gigs (1 gig each slot) of 533mhz speed (or less)
it also supports up to 2 gigs of sdram either pc133 or pc100
you are using 400 speed ram as you stated i would upgrade to a 533 speed ram as it will be faster, but this is not necessary. as for the cpu just get any P4 (pentium 4) that is 3.0 ghz or less and it will work.

Asus gives this as the board memory spec:

-4 x 184-pin DIMM Sockets support max. 4GB DDR400/333/266 non-ECC DDR SDRAM memory

I suspect you bought DDR2 type memory.

yes... that is compatable.

Your mobo is quite old and its chipset can only support a maximum of 512MB PER SIDE (technically called a bank) of a memory module. I would guess that your 1gb memory module has 8 chips that are all located on one side of the module, putting all of the 1 GB on one bank. Thus, only 512MB of your 1 gb RAM is detected and usable by your motherboard (the remaining 32 mb is most likely being used by your onboard video). You'll need to find a double sided 1 gb memory module (usually 8 chips on each side).

Your motherboard supports 2 different fsb's.
look these up @ cpu-world
you can use:
Intel Pentium 4 processor (478-pin)
- 533MHz system data bus - supports up to 2.8 GHz
- 400MHz system data bus - supports up to 2.4 GHz

Intel Celeron processor
- 400MHz system data bus - supports up to 2.0 GHz CPU speed
and here are the suppoted cpus:
Intel Celeron RK80531RC029128 BX80531P170G128 1.7 GHz 17 x 400 MHz, Willamette Any A RK80531RC033128 BX80531P180G128 1.8 GHz 18 x 400 MHz, Willamette Any A RK80531RC037128 BX80531P190G128 1.9 GHz 19 x 400 MHz, Willamette Any A RK80532RC041128 BX80532RC2000B 2.0 GHz 20 x 400 MHz, Northwood A 1.525V not supported RK80532RC045128 BX80532RC2100B 2.1 GHz 21 x 400 MHz, Northwood A 1.525V not supported Intel Pentium 4 RK80532PC021512 1.5 GHz 15 x 400 MHz, Northwood Any A RK80532PC025512 BX80532PC1600D 1.6 GHz 16 x 400 MHz, Northwood Any A RK80532PC029512 1.7 GHz 17 x 400 MHz, Northwood Any A RK80532PC033512 BX80532PC1800D 1.8 GHz 18 x 400 MHz, Northwood Any A RK80532PC037512 1.9 GHz 19 x 400 MHz, Northwood Any A RK80532PC041512 BX80532PC2000D 2.0 GHz 20 x 400 MHz, Northwood A 1.525V not supported 2.1 GHz 21 x 400 MHz, Northwood A 1.525V not supported RK80532PC049512 BX80532PC2200D 2.2 GHz 22 x 400 MHz, Northwood A 1.525V not supported RK80532PE051512 BX80532PE2266D 2.26 GHz 19 x 533 MHz, Northwood A 1.525V not supported RK80532PE056512 BX80532PE2400D 2.4 GHz 18 x 533 MHz, Northwood A 1.525V not supported RK80532PC056512 BX80532PC2400D 2.4 GHz 24 x 400 MHz, Northwood A 1.525V not supported RK80532PC060512 BX80532PC2500D 2.5 GHz 25 x 400 MHz, Northwood A 1.525V not supported RK80532PE061512 BX80532PE2533D 2.53 GHz 19 x 533 MHz, Northwood A 1.525V not supported RK80532PC064512 BX80532PC2600D 2.6 GHz 26 x 400 MHz, Northwood A 1.525V not supported RK80532PE067512 BX80532PE2667D 2.66 GHz 20 x 533 MHz, Northwood A 1.525V not supported RK80532PE072512 BX80532PE2800D 2.8 GHz 21 x 533 MHz, Northwood A 1.525V not supported

ya it has ddr u could beef ram up aint much chip u can get higher in this mobo need new mobo to run quad cores amd ect is am2+ mobo better cheaper ram too get more up to 8 gb 16 sum mobos on new egg

Yes, your mobo Asus P5LD2-VM support CPUs with Conroe-core ("Core 2 Duo"). http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us&model=P5LD2-VM But for new CPUs strongly recommended use last BIOS version - 1401 from 2007/08/14. http://dlsvr01.asus.com/pub/ASUS/mb/socket775/P5LD2-VM/P5LD2-VM-1401.rar

Hi, For an ASUS P4BGL-VM Intel 845GL Chipset Ultra ATA100 MATX CPU Type: Intel Pentium 4 478-Pin (OEM), the Asus site specifies max of 2 x 184-pin DIMM Sockets support max. 2GB PC2100 / PC1600 non-ECC DDR or SDRAM memory but not "and". Personally, I find it more practical to install 2 X 1Gb rather than a single 2Gb. Hope this gives you some idea. Kind regards.