Problems with Dell Dimension 8400

Here's what I saw:

Fan to high speed + beep
I would have 4 or open several tabs in Mozilla Firefox. Then all of a sudden my monitor will be failure resulting from my computer on high-speed only fan... I hold the power button to turn off, and when back, I get high-speed fan and a sound signal at the same time. (model: BEEP...) BEEP... A SOUND SIGNAL)

My workaround is to disconnect the power supply to the back of the computer (for 3 days or more)
I then turn on without high-speed or the beeping fan, but I have to set the correct time and the Date. After a day or two, the power/fan speed/bip cuts come back again...

Freezing point
After logging in, using my computer for about 10 min. results in gel.
In addition, I tested by doing nothing and leave the open Task Manager and it would freeze again. (Performance tab) Task Manager is no high CPU usage and low activity on the use of the Page file. There is no fan at high speed or the beeps until I hold power button / stop and turn it back on.

My computer is showing its years, but I doubt it's a virus because I subscribed to Webroot SecureAnywhere.

So, which of them could be the cause this or a solution?

-Replacement of a new motherboard (maybe a fight?):
www.eBay.com/.../281435662241

-Upgrade the processor of Pentium 4 670 or 672?
ark.intel.com/.../Intel-Pentium-4-Processor-670-supporting-HT-Technology-2M-Cache-3_80-GHz-800-MHz-FSB
ark.intel.com/.../Intel-Pentium-4-Processor-672-supporting-HT-Technology-2M-Cache-3_80-GHz-800-MHz-FSB

-Upgrade to 4 GB of RAM:
www.eBay.com/.../360553412754

Batteries CR2032 DL2032 are inexpensive.  Get them out of these systems may however break the plug.

http://www.Amazon.com/long-life-lithium-button-batteries-count/DP/B000EA1IJS

To replace the battery:

Record all the screens in System Setup so that you can restore the correct settings.

Locate the plug of the battery on the system board.

Remove the battery by pressing the tab, which will free up the battery to the socket of the battery.

Insert the new battery into the socket with the side marked '+' upward and the battery snap.

Tags: Dell Desktop

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