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My Desktop PC Intel P 4 processor is no longer send data, nor is green light blinkin

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Hi,

My Desktop PC Intel P 4 processor is no longer send data, nor green LED light is blinking::

My Desktop Specs are:::

Desktop Computer(Intel P 4, 512MB of RAM(DDR), and Graphics Card with 256MB of RAM)
My P 4 has a motherboard integrated Graphics Card, Audio Card, and Network adapter. The motherboard manufacturer is Asrock(775i65G(REV: G/A 2.12)

Fortunately, I've made a detection of my PC before happening this problem by a hardware detection program(Speccy), and this is its:
Code:

Summary
  Operating System
  Windows XP Professional 32-bit SP3
  CPU
  Intel Pentium 4 531
  Prescott 90nm Technology
  RAM
  512MB Single-Channel DDR @ 159MHz (2.5-4-4-8)
  Motherboard
  775i65G. (CPUSocket) 42 °C
  Graphics
  Standard Monitor (800x600@1Hz)
  Storage
  37GB Western Digital WDC WD400BB-75DEA0 (ATA)
  Optical Drives
  COMPAQ CD-ROM LTN486S
  Audio
  No audio card detected

First of all: My PC was working well. So, I would like to be saying that one of thes things might cause this problem:

First: My PC has two-DDR RAM slots. One of them doesn't have one lock buttons located on the ends of the slot which used to tighten the memory card in the slot. aa 512MB of RAM is installed on the first slot which has both luck buttons. However, the other slot was empty.
I have taken out the RAM from the first slot, and then installed it on the second one which doesn't have only one lock button.

Second: I have Full Auto AC voltage Regulator with two outputs:
One is 220V, and the other is 110V.
If I forgot, and plugged the AC cable to be connected to my PC to the 110V socket instead of 220V which is normal on my own country. Then, I think that the power supply, or HDD of my PC would have been blown out/damge, but not my CPU or RAM by the 110V.



My problem is:
  • Whenever started my PC. I found there was no data sent to my monitor at all. Depending on manufacturer, there may be different numbers of LED lights on a PC. The position of the lights, and their color, may vary, I noticed that the Green LED light was no longer blinking at all(I think that this LED indicates processor activity). However, Red LED, which indicates HDD activity, was still blinking.
  • I have smelt something burning once I first start my PC, I don't know what it was. I guess that the RAM card was burning since it was installed on a disintact slot.
  • Even when pressing on the key booting me to the BIOS, there was no thing booting at all.
  • Also, the optical drive could be ejected out. However, when inserting a bootable CD inside it, then no data at all shown on the monitor.
The solutions I have thought of were, and I tried the second one:

Firstly: I was expecting that installing the 512MB of RAM on the second slot might be causing the problem since the slot is not intact. Then, I reinstalled the 512MB on its original first slot on which PC was working well. However, I found there was no data sent at all.
Secondly: To be quite sure, I have installed my HDD and internal power supply on another Desktop Computer(Intel P 3, 256 MB of RAM, and Nvidia Graphics Card with 128MB of RAM.), then they worked well.
Thirdly: My P 4 has a motherboard integrated Graphics Card, Audio Card, and Network adapter. I don't think that there is a problem with graphics Card. Do you think that I can install a discrete graphics card on one of the PCI Express slots.
Fourthly: If the RAM was defective, then do you think I would need to install a DDR with the same size 512MB.
Finally: If the CPU was infective, then do you think that I would need to install Intel P 4 with the same speed.

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