I have an old HP Pavilion desktop as follows:

HP Pavilion a1640n 0nx1114RE101BUCKE00
Enclosure Type: Desktop
Processor a Main Circuit Board b
1.87 gigahertz Intel Core 2 Duo
64 kilobyte primary memory cache
2048 kilobyte secondary memory cache
64-bit ready
Multi-core (2 total)
Not hyper-threaded Board: ASUSTek Computer INC. Buckeye 1.05
Bus Clock: 266 megahertz
BIOS: Phoenix Technologies, LTD 3.17 08/21/2007

and an older Compaq desktop as follows:

Compaq Presario SR5010NX
Celeron D processor 360
Vista Home Basic
512 MB RAM
120 GB HDD
Intel graphics media accelerator
DVD/CD w/Lightscribe

Recently I performed a clean install of Win7 HP on the Compaq HDD and upgraded the RAM to 1GB, which can be further upgraded to a maximum 2 GB, which I had planned to do asap as well given the excellent initial Win7 performance, even with only 1 gig of memory. In checking 1) the chip/heatsink contact and 2) the cooling fan because of ridiculously loud noise coming from the area of the fan, I found virtually no remnants of thermal compound and a poorly performing fan...maybe bad bearings or just too old? Also, several tiny prongs comprising the bed on which the chip actually lays when clamped over are damaged. So I've made the decision to reinstall the newly clean Compaq HDD with Win7 HP into the HP, currently also with no drive...both mobo's are designed for SATA. The Compaq model I want to transfer from the Compaq to the HP is a Seagate Barracuda 7200.9 160GB drive. Upon installing the Seagate HDD into the HP, which has 4GB RAM, I was not able to boot into Windows 7 and could only hear a series of beeps in succession, the first one about 2 sec, the second, about 4 seconds...short beep/long beep, short beep/long beep, etc.

I'm 90% sure I have all the connectors right in the HP, but I'm leery of the 4-pronged jumper all the way to the right of the back of the Seagate, which has no connector to it...I honestly don't remember a connector to it on the Compaq mobo, but not 100% sure. Is that the reason my system won't boot from the clean install Win7 HDD? I was pointed to info re beep codes and BIOS reset, but I'm not sure if I understand it :/

Can someone please help me resolve this dilemma so I can have a successful boot?

Thanks.

sbuxman