Computer continually restarting after installing 2nd internal hard drive

I just installed a Seagate hardrive Seagate 250GB 3.5" SATA HARD DRIVE ST3250824AS
and have tried turning the computer on. it booted to the point where I saw the desktop image, then immediately turned itself off and rebooted. this kept happenning for several minutes.
I’m just wondering if there is a simple answer/cure for this.

Unplug the new hard drive.

Test to make sure you haven’t caused any damage…reboot the machine without the new drive. If it runs ok, shut down again.

Examine the SATA power supply connector you used on the hard drive. Try a different connector/adapter if you want to test the new drive again. Try a different SATA data cable and/or another SATA port on the motherboard.


additionally try this:
Get Seatools for DOS and prepare a bootable media (CD, Floppy,…) according to the instructions.
Then disconnect your working HDD, insert your Seatools media, boot from that and thoroughly test your new HDD.

EIDT: This could be useful also: Serial ATA Troubleshooter