very slow start up

  will the conk 17:52 26 Jul 2005

switching on the computer I get the screen which shows the Main Processor is Intel Pentium 4 2.66GHz (133x20.0) the rest of the screen is blank with press F1 or DEL to enter setup right at the bottom. In other words it does not show the IDE drives etc. This screen stays for a long time ( approx 2mins 10 secs) and then I get the found iDE drives followed by the windows XP home which is my OS. and it goes through this, and then the screen goes blank once again but after a further 1min 20 secs it comes up with the Users details which on my computer is 4 people. On clicking on my user detail I get the MS music and up comes the desktop with icons. Over all this has taken 4.5 mins.
Has anyone any ideas as to what has happened to cause this? I am a 72 year old brit, so not the quickest on the planet,but any help will be more than appreciated.
Pressing F1 or DEL on the opening screen do NOTHING.
Also the computer takes a long time to close down.
Your help and/or advice will be appreciated, particularly if it is simple ( Like me)

  Graham ® 17:58 26 Jul 2005

Do you have Norton Antivirus?

  will the conk 21:20 26 Jul 2005

Hello Graham,
Yes I do have Norton Antivirus, but it is not a new download, it has been running for ages without this happening. This just hangs,before it shows the memory (512) and the IDE drives.
Await further comments.

  Graham ® 09:27 27 Jul 2005

I wonder if the PSU is the cause.

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