Also try defragmenting your hard drive and checking for any hard drive issues. It secondly (if it isn't malware, was also my first assumption) might be caused by a hard drive issue as it seems...

Yep deffinetly sounds like a gammy PSU, what pin does your motherboard have and what pin is the PSU?

You should be able to pull the big cable out with about 15-20 wires in it.

Then you can...

Depends were your from, parts aren't really shipable. I'm from the UK so I doubt I will be much help.

Valid point from Rik...

Try accessing the BIOS and finding out exactly what your CMOS is posting.

I think clearing the CMOS might make a significant difference. Basicly take the top (where the keyboard is) off your...

You may need to reset the bios, as far as I know this should be fine on a dell. This should change the settings back to default and should recognise the hard drive as it did from factory.

If this...

I would first suggest taking the motherboard out of the case and connect JUST the PSU, this should make the MOBO light turn on, if it doesn't then this is a faulty motherboard. The mother board...

You could always download Hijack This run a scan and then post the log, and also malware bytes will remove most viruses but as said before it will sometimes shred your regisstry depending on how far...

I stand corrected! Very valid point.

In this case this is most likely something to do with a faulty motherboard...

I know this seems like a daft suggestion (I am just guessing know as it deffinetly seems to be a MOBO issue yet you...

You have no RAM in the system?

Just to add to this, you may find it was your DIMM port had dust in it this usually causes thisd issue so yes the dusting will have fixed that, but be carefull when dusting, you need to ground you...

As RJCO said the motherboard should not touch the case try removing the motherbard from the case and running it without the case. It sounds like maybe ou need some thermal solution or maybe it's a...

I'm not sure what you mean by a virus is detected when you format your hard drive.

When you format your hard drive you are wiping it clean and reinstalling the operating system. So you should...

I've got a similar build:
CPU: Intel Pentium 4 Duo (E5200)
RAM: 1GB DDR2 667MHz
HDD: 150 GB Samsung Spinpoint F1
MotherBoard: ASUS P5KPL-AM

And I've never really had a problem with the speed....

Format your Hard Drive