PC freezes on Windows XP loading screen

[terabyte]

Hi,

the problem that i have is when i start up my pc it will freeze on the Windows XP loading screen (the splash screen with the loading bar, just before the welcome log-on page).
This is mostly when i start up my pc manually but if i restart my pc in windows it will not freeze. The other thing i found is when i shutdown my pc and switch on/off my psu and then manually power on the pc it will not freeze i tried this like 20 times or so and no freeze with this method.

the things i already tried
changed the psu but the problem was still there
did run memtest for 40 minutes (in windows it self)
i also did run chkdsk at start up with the  /f /r (didnt find any problems i think)
i changed the ram to a different socket also didnt help me out with this problem

if i get in to windows it will not freeze so the freezing is only at the start loading screen of xp. i can also go to in safe mode with the switch on/off method. i also can go to my bios without any problems. but like i said even i dont try the steps of switching on/off the psu sometimes it will boot normally without any problems or freezes. but most of the time it will freeze after starting up manually with the power on button.

What do you think could be the reason for this? I was suspecting the power supply, but also after changing the psu it seems that it isnt the psu. so what else could be the problem i really hope it isnt the mobo cause at this momment i cant get a new one.

i hope someone has a solution for this.
thanks

[Allan]

I really don't understand. You say if you reboot from within the OS it boots fine, and if you shut down, power off and then power on it boots fine. What is the option I'm missing?

[Computer_Commando]

All I can understand is that it has something to do whether the PSU is on or off.  When PSU is on, there is power (+5V) supplied to the motherboard which enables the case power on/off switch to function.

[terabyte]

hi,

again to make this clear. everytime i start up my pc it will freeze at the loading screen like i said before ( and that the problem i have and i am searching for a fix)

but when i switch off and on my psu and then power on my pc it will not freeze. but if i dont switch off and on my psu it will just freeze at the loading screen of windows xp.
i hope you guys understand my problem.

[Computer_Commando]

Any USB devices connected to the computer?

[terabyte]

only the mouse and keyboard

[Computer_Commando]

Check the voltage on the CMOS battery.

[terabyte]

i just checked the voltage and it seems the cmos battery is dead.
it hasnt any high voltage as i can see. but i didnt notice any problems with the bios or saving any changes to the bios.
could this be the problem?

[Computer_Commando]

i just checked the voltage and it seems the cmos battery is dead.
it hasnt any high voltage as i can see
could this be the problem?

What do you mean by "it hasnt any high voltage"
Battery should be 3.0V.  Are you measuring with battery removed & with voltmeter or battery tester?
If it's near 0V, this is mostly likely the problem.

[terabyte]

i have removed the battery and i did tested with a battery tester.

[Computer_Commando]

Replace battery & all will be good again.  CR2032 is available at every drugstore in North America.

[terabyte]

ok will do
i will replace this with a new one
i only hope that this will fix the problem
anyway thanks for the great help
i will be informing you if the problems has been solved with this or not

thanks again for the help.