Freeze before boot

[Silver]

Ok i'll make this simple
1. I start the computer.
2. It does the memory check
3. it freeze right after that
4. keyboard doesn't respond
5. if i push keyboard before or during memory check its calls keyboard error and freeze, always after memory check.
6. I change the hard drive. does nothing after memory check.
7. I change memory (SDRAM). does nothing after memory check.
8. I remove Cmos battery for 24hrs and put in a new battery. didn't change a thing.
9. Cleared CMOS with the pin thing. did nothing for the computer.
10. Can't enter CMOS cause freeze before i get a chance.
11. USB keyboard. see number 5
12. Forget floppy or CD since it freeze before that and you know after memory check usally computers check hard drives, floppy and cd-rom for their name then start booting up in their repected order but mine doesn't even get to that thats y i change cd-rom, hard drive and floppy but nothing change.

Specs
Processor: pentium 2 266MHz
Motherboard: intel
Memory: 256mb
Cooling: a fan
Videocard: ati agp 2mb
Soundcard/Speakers: Opti
Hard Disk: 3.4 gig
CD-rom: 48x cd-rom
Case tower/desktop


so i'm out of ideas can you please help me.

 

[OS samurai]

do you get any beep sounds from your system? if so how many?

 

[Silver]

no beeps nothing.
I forgot to mention that there are no sounds and the light that shows when the computer is using the CPU is always ON

 

[Masque]

How long have you had this system? Also, have you just started using the USB keyboard? If so, can you connect a normal keyboard to see if you get the same results?

 

[Silver]

i think the base model 6 years but change some parts over time and normal keyboard or USB nothing change
most recently the memory but the memory is ok cause i can place other same type memory in the slot and he aknowkledge the switch.