guys
i have mandrivia 2008 , and i have tried opensuse..
memory 256 mega
processor celeorn 1.1
i have tried 2 hdd , 1 17 giga and the other 80.

my pc make something strange , when it tried to boot regularly , it restart itsel when it run one of the 2 scripts( i don't know which one exactly)
S25haldaemon ,S14acpid..
i don't know the motherboard type but i know the bios verion, award bios V6.00pg.

to load the pc i have removed the above scripts from runlevel 3 , then i go to failfaith , then telinit 3 and then startx , so i can bypass the scripts which reboot the pc..

the pc work fine , but when i run some programs which overloads teh pc power it restart itslef..
for example..
azures + firefox + konquerer + open office..
it just restart itself...

why it do that ? and why the scripts make it reboot ?
i have run the pc for a day without stopping but when i try to run more programs it restart at once!!

before retsarting i was noticing the ram , it was full , and was using about 50 meg from swap..i know that the pc capipalties is so weak , but hey i was working on a pc less than that one and was not doing so , this one is my upgrade

Use a program such as memtest86 (included in some popular distros or freely downloadable) and ensure your RAM isn't at fault. It sounds like a hardware issue and that is an easy place to start.

Good luck.

i m sorry i think it is not teh memory.
here what i have done.
1- i have tried memtest..it kept testing and saying everything is ok , untill 75% then it made restart
2- i have taken away both he 2 128 mega rams and put another ram and it still restart

any ideas ?

1- What Linux distro was you using on the 'older' PC?
2- What CPU and how much RAM did it have?
3- What size RAM did you install when you removed the 2-128m chips?
4- Does the clock-speed and type of RAM meet the specs of the MoBo?
5- How long did you have the 'upgrade' PC before you started having problems?

Just because the RAM chip fits doesn't always mean it will work. I agree with waylandbill- it seems to be a problem with the memory, whether it be the size, type, compatibility with the system, or a bad chip. If that's not the case, then you have a problem with the MoBo.

well i had 2 pcs ,well at least untill today at the morning .
the old one :
processor 533
ram 128 + 64
os mandrivia 2008

the new one
processor 1.1
ram .......
os .............
mobo don't know , there is nothing written on it at all , but i thnk it is manli( 810 )..that is written on it !

about specification of ram i don't know , because i don't know the mobo and i don't have manual , but i m working on that..

the case now :
i m writing this meesage now from the new pc , with mandrake 10.0 , using just 64 of ram..it is working with just 64 , with kde , with no problem at all..
when i try to install a new module of memory , it refuse , i have make the bios to defualt .the memory modules is working because i was using it on my old pc , and it was well..but now it is refused by the new mobo..i saw in the bios alot of things related to the sdram configration like latency time , and alot oif times..can it be just the configration of the memory at the bios ?
now since i work on mandrkae 10.0 and all is well , is it possible that mandriva 2008 is making probelms ?i will try to install windows and see if there is any problem or not.
forgot to say , my old pc is dead , i have misplaced the memory modules on it , so the mobo and the memory modue was blown

>when i try to install a new module of memory , it refuse , i have make >the bios to defualt .the memory modules is working because i was using >it on my old pc , and it was well..but now it is refused by the new >mobo..i saw in the bios alot of things related to the sdram >configration like latency time , and alot oif times..can it be just >the configration of the memory at the bios ?

Without knowing the motherboard, it may a hit and miss guessing game finding the correct memory module. There are several different speeds of SDRAM, not just different sizes. If you took one from the old computer, you may have gotten one that has a speed that doesn't meet the new board's minimum specs.

I always try to get a motherboard stocked and tested not only with a cpu, but with memory as well so as to not have a guessing game.

you could try using lshw -c memory to check the type of memory in your system..

Spontaneous reboots are almost always caused by a hardware issue. (Faulty motherboard, Weak power supply, etc.. )