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Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, the above describe "...blinking...cursor line..." would indicate that the system is unable to locate a bootable device.
Have you checked / changed the boot priority in the BIOS? ...to boot first from the CD or USB?
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A possibility to consider is that the USB ports are not enable at boot up.
Or is the "...new cd drive installed externally ..." connected by USB and shows signs of power when booting?
Have you tried re-installing/using the original CD drive? ...using it as a boot device?
The Windows 10 disc in the original CD drive?
Yes please; i.e. Win10 install disc in original CD drive and set this as the boot priority.
Did the BIOS detected the new HDD?
After the CD Drive is shown as the first bootable device, next in line would be the name/model of the new HDD. Thsi would indicate that the Gateway GT565 has detected both the original CD drive and the new HDD.
Interesting as it appears the CD is not reading the Win10 disc.
Can we try the "...usb flash drive with windows 10..." and ensure that the Gateway GT565 would boot from the USB/flashdrive?
These results would be indicative of a potential motherboard issue.
Have you tried a RESET of the MB?
Consider a RESET. A reset is both a test and a try of a fix. As it implies, a reset would force the unit to revert back to factory defaults removing glitches and config errors but would include memories, presets and user preferences. After a reset, the initial setup would have to be performed. If have not been done and should you venture to try: there normally would be a jumper for this purpose. Alternatively, remove the CMOS battery for an extended period of time.
May have to be done a number of times.
This is very critical - a reset however would not be corrective of an internal hardware concern; but it would be confirmed. In some instances, it may even expose/cause other issues.
Yes it can be started but it would not save any of the BIOS settings hence Date/Time would have to be set every time it is booted.
Apologies; sluggish Internet.
...screen was different?
Please re-install the battery and set the date/time.
...then go through attempt installing Win10 as above.
Let's step back;
With the old CD drive, old HDD and USB flash drive remove, connect the new external CD drive. Ensure BIOS is set to this bootable device.
Boot Win10 disc using the external CD drive.
The RESET was done right particularly if the jumper is now back into its original place.
That it does not boot from either USB Win10 would be a warning sign.
That it does not even from its original CD drive + Win10 disc actually confirms it.
I'm inclined to suspect a motherboard issue.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround as it is a motherboard/hardware issue; sorry for having to be the bearer of bad news.
Appreciate the rating.
Good luck and thank you too for the opportunity to share the information.