Issue with my rebuilt desktop

[Max]

When I power up, sometimes it w.ill boot to the mobo splash screen and then Win7. Other times it won't boot anything.

Two weeks ago it wasn't booting...I took it to the shop where they switched BIOS from UEFI to Legacy and reset the boot order. The DVD drive is listed #1 and the HD is listed as #2 in boot order. They said it didn't matter which drive was #1 

I get it home and it doesn't boot. Take it back and it does boot. Went thru this 2 more times. They thought something was "shaking loose" during transit. They came to the house, reseated RAM sticks and checked SATA cables...everything was fine till a few days ago.

When I power up now, the blue case HD indicator is solid blue for about 5 seconds. If there's no screen, it goes dark. If I get a normal start-up it blinks intermittently...as it should. For whatever reason, the system is or isn't recognizing the HD. The HD is 6 months old and was rock solid prior to the rebuild.

Would appreciate any ideas as to the cause and remedy.

Thanks

[MrRiplEy[H]]

When they tested it, did they replace any hardware in it?

Random boot problems may be coming from a failing power supply.

[Skuzzy]

Random boot problems are the worst.  Could be hard drive (handling a hard drive which had been running for a long time can cause it to fail due to oxide deposits breaking loose in the case and damaging the media), or motherboard, or RAM, or power supply.  Just about any piece of hardware in a computer can cause it.

[Max]

PS is brand new. HD is 5 months old. I reseated the vid card, RAM and double checked all power cables. I swapped in a new (old) ATA from the HD to mobo and it started normally. Keeping my fingers x-d.

[steely07]

Does the new machine have a new SATA drive?, if so, is it SATA 3?, if both are true, make sure your SATA cables are also SATA 3, I had similar problems when I upgraded my drives from SATA 2 to SATA 3 and used the old cables, sometimes it would see all the drives, sometimes it wouldn't.

After swapping the SATA cables to SATA 3 ones, no further issues.

Admittedly, it could have just been a bad cable, as I know SATA 2 and 3 are compatible, all I know is, I was having some really weird issues until I bought new cables, and have not had a one since.

Steely

[Chalenge]

The cheapest parts in your system are those little cables.

[Max]

So true Challenge.

So far, so good; stability wise.