1 long beep when I start power on

Asus mb
Intel P4 2.4 GHZ 512


when I first power on I get 1 looooong beep and continue to beeep

I tried putting the cpu out and in again the cpu is madly hot after powering on for 4 seconds extreme hot may be around 50C hot

I tried replacing the RAM

Power supply is good

I replaced the video card as well

when I took out the CPU and powered it on I got noo beeps at all just fans are running but when I put the cpu back in it beeeps 1 loong beeeep over and over



what happened was I was replacing the thermal compound and cleaning the old off the old compound got inside the CPU inside that whole so i'm not sure if that cause anything...


how can you tell if it's ur mb or ur cpu?

thank you all for reading please help!


MB-ASUS P4S533-Vl
CPU- Intel P4 2.4 GHZ /512/533 SL6RZ 3308a442-0521

SONY VAIO PCV-RZ22G Desktop PC

there is a on board video but mainly I use Gforce Mx440
Stock PSU fans and lights and cd roms every thing turns on

 

I forgot to mention that I also changed the thermal compound for the Northbridge heat sink ... now I kept trying it today and there is no 1 long beep any more does nothing I kept trying and trying and I feel the CPU gets hot .. kept trying and now I see something new after taking off the heat sinks . I noticed the lan network light comes on when I connect the PSU to electricity then when I try to turn the PC on it does nothing... I cut Disconect the electric power... then I connect it again this time I don't see the light to the network on any more.. this time I try to power the pc on .. the 1 long beep comes back again.

 

youtube.com/user/chickenstars77/videos

 

youtube.com/watch?v=1KnbPkHLIdo&feature=plcp

 

youtube.com/watch?v=1KnbPkHLIdo&feature=plcp

I recorded and explained what goes on PLEASE HELP!

 

In that first video, it looks like you are powering on the system with no heatsink on the cpu, is this correct?