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Very unusual behavior.

From a hardware standpoint, it would not hurt to change the IDE cable.

How big is your power supply?
Since you said a new motherboard, an older 250 Watt power supply may not be big enough.

Next, you might want to setthe drive parameters in BIOS settings rather than using auto-detect.

Is there a drive overlay (or similar) program installed on the drive?
Many times if you set up a drive with the floppy provided by the drive manufacture, you get a utility installed even if you don't want or need it.

I myself have a couple of motherboards that do not like to re-start.
They go into PC health error mode on a re-start.
So, the mother board is a very likely source of your problem. Especially if the problem did not start until you changed motherboards.

1 thing to check there, is to set the CPU buss and multiplier manually.
I have had several different Socket A motherboards that had strange startup problems until I manually set the CPU F.S.B. and multiplier.

How much RAM is installed?
And, what version of Windows are you running?
Windows 9X / Me has a bug where strange issues can crop up if you have more than 511MB of RAM installed.

There is some concern that some motherboards do not fully clear the RAM on a re-boot, and that may be at the root of your problem also.

Check with the motherboard mfg, and see if they have a BIOS update that specifically deals with hard drive detection, or re-start issues.

If this answer does nothelp you, please add more details on the specifics of your system.
The more information we have, the better we can assist you.

Chas

You can try doing this:
Get all the details of the Hard-disk you are using from the data printed on it. Get into the BIOS of the computer and remove "AUTO" for detecting the HDD. see of that solves your problem.
Cheers

Try to Degausse the system. Disconnect the power supply, (disconnect the power cord from back of unit) press the power button on front of unit, hold it down for 15 seconds, release it, connect the power supply. Start normal and try to restart with small button.
If it helps let me know.

FIRST THING IS..I WANT TO ASK ABOUT YOUR MOTHERBOARD.A NEW MOTHERBOARD OR THE OLD MOTHERBORD..IF THERE IS THE OLD..SO I CAN TELL U THAT THE PROBLEM IS YOUR MOTHERBOARD.AND THEN YOUR HARD DISK..THE NEW HDD IS NOT SUITABLE FOR OLD MOTHERBORD.BUT THE OLD HDD STILL CAN BE RUNNING ON THE NEW MOTHERBOARD..ALSO CHECK THE JUMPER SETTING AT YOUR HARD DISK.IS YOUR PC IS STAND ALONE?PLEASE CHECK YOUR BIOS.MAYBE THERE IS A VIRUS.
AND CHECK YOUR IDE CABLE.IS IT SUITABLE FOR YOUR HARD DISK? TRY TO REPLACE ANEW IDE CABLE.
AND CHECK ALSO YOUR (RESET JUMPER)(POWER SWITCH)(SPEAKER) AND PLEASE MAKE SURE IT IS ON THE RIGHT PLACE.
IF THERE IS A PROBLEM ALSO...I THINK U MUST FORMAT YOUR HARD DISK TO ENSURE THAT ALL SETTING IN YOUR HDD THAT MAKE THE PROBLEM CAN BE REMOVED.
HANGGING..OH..BIG PROBLEM..MAYBE CAUSE OF YOUR RAM,YOUR SOFTWARE,YOUR DATA IS NOT AT THE DATA AREA IN YOUR HARD DISK...

Another thing to note is that sometimes if I left my pc turned on over the weekends, I will see a blue screen with the message that my hard disk cannot be detected. If I press the small button after that, it will reboot but hangs when it is trying to detect the hard disk. Only when I reboot via the big button will it detect the hard disk and carry on from there. It even happen when I return from lunch.

Sometimes I'm working, the system will run low of memory and run very slow, I will attemptto reboot but while i'm closing my applications, the blue screen will appear too.

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