Computer wont start on restart

[cvy]

Hey guys, I have dual core intel processor (3ghz), intel 946GZIS motherboard, and 1Gb RAM.. The problem
with my comp is that when ever i "restart" my windows, it just wont boot.. I get  a blank screen, but the leds are
working... Then i have to switch off the comp and wait for about an hour and switch it on again...
I have tried changing the ram, tested my monitor on another computer, and found that its not the problem...
Can anyone please give me suggestions?
This problem occurs when i sometimes shutdown, or hibernate... But is mostly seen when i restart..
I have tried re-installing windows, but it didnt help...

[Broni]

When it doesn't want to restart, can you hear RAM beep, hard drive, fans spinning?
What Windows version?

[cvy]

The motherboard makes the usual noises, the fans are all running.
I am using Windows XP, but i think its a hardware problem...

[Broni]

Motherboards don't make any noise.
Can you hear RAM beep, and hard drive spinning?

[cvy]

Well i do hear the usual noise... I dont know if its from the ram
or from something else.. The hard disk spinning, i am not sure... how do
i check that? My hard disk is a really silent one...

[Broni]

Can you hear RAM beep?

[cvy]

Well I am not sure if the beeps coming from the RAM.. I didnt know that
the RAM beeps...

[Broni]

When you start/restart computer, the very first thing, you should hear is a single short beep. That means, your RAM is OK.
Can you restart, and see, if you can hear it?

[cvy]

Yes i do hear the beep when i start my computer... But i dont hear it when i restart my comp...

[Broni]

Aha. You may have some RAM problem then.
Turn computer off. Open the case. Ground yourself. Re-seat RAM.
Don't close the case.
Try to start, and restart.
If same problem, and you have more, than one RAM stick, repeat the procedure, but with one RAM stick at a time.
Same problem?
Run memtest: http://www.techspot.com/vb/topic62524.html

[cvy]

Well i had only 1 ram stick... I had removed it cleaned it placed it back...
No good... Tried it with another working ram from my friends computer..
Still no good...

[Broni]

Tried it with another working ram from my friends computer

Are you sure, it's correct type of RAM?
Did you try to put your RAM in different slot?

[cvy]

I am sure its the correct type of RAM... its DDR2,  667mhz... By the way, if the RAM
is not the correct type, it wont fit... Yes i tried it in both the slots... still no good...

[Broni]

You may have motherboard problem, but wait for better hardware experts to chime in.